Heat Transfer Improvement in Automotive Brake Disks Via Shape Optimization of Cooling Vanes Using Improved TPSO Algorithm Coupled With Artificial Neural Network

2017 ◽  
Vol 10 (1) ◽  
Author(s):  
Javid Karbalaei Mehdi ◽  
Amir Nejat ◽  
Masoud Shariat Panahi
Keyword(s):  
Heat Transfer ◽  
Shape Optimization ◽  
Heat Dissipation ◽  
Optimization Technique ◽  
Research Work ◽  
Computational Cost ◽  
Heat Removal ◽  
Superior Performance ◽  
Shape Transformation ◽  
Artificial Neural

One important safety issue in automotive industry is the efficient cooling of brake system. This research work aims to introduce an optimized cooling vane geometry to enhance heat removal performance of ventilated brake disks. The novel idea of using airfoil vanes is followed as the basis of this investigation (Nejat et al., 2011, “Heat Transfer Enhancement in Ventilated Brake Disk Using Double Airfoil Vanes,” ASME J. Therm. Sci. Eng. Appl., 3(4), p. 045001). In order to perform the optimization technique efficiently, an integrated shape optimization process is designed. According to the aerodynamic and heat transfer considerations, first an appropriate airfoil is selected as the base profile to be optimized. For the shape modification purpose, a curve parameterization method named class shape transformation (CST) is utilized. The control parameters defined in CST method are then established as the geometrical design variables of an improved territorial particle swarm optimization (TPSO) algorithm. In order to overcome the potential bottleneck of high computational cost associated with the required computational fluid dynamics (CFD)-based function evaluations, TPSO algorithm is coupled with a predictive artificial neural networks (ANN), well trained with an input dataset designed based on the Taguchi method. The obtained profile shows an evident convective heat dissipation improvement accomplished mainly via airflow acceleration over the vanes, avoiding early flow detachment and adjusting the flow separation region at the rear part of the suction sides. The results also reveal the approaches by which such a superior performance is achieved by means of the modified surface curvatures.

Large-scale economic load dispatch using squirrel search algorithm

2020 ◽  
Vol 14 (6) ◽  
pp. 1351-1380
Author(s):  
Sakthivel V.P. ◽  
Suman M. ◽  
Sathya P.D.
Keyword(s):  
Power Plants ◽  
Large Scale ◽  
Optimization Problems ◽  
Search Algorithm ◽  
Optimization Technique ◽  
Research Work ◽  
Superior Performance ◽  
Economic Load Dispatch ◽  
Fuel Cost ◽  
Content Type

Purpose Economic load dispatch (ELD) is one of the crucial optimization problems in power system planning and operation. The ELD problem with valve point loading (VPL) and multi-fuel options (MFO) is defined as a non-smooth and non-convex optimization problem with equality and inequality constraints, which obliges an efficient heuristic strategy to be addressed. The purpose of this study is to present a new and powerful heuristic optimization technique (HOT) named as squirrel search algorithm (SSA) to solve non-convex ELD problems of large-scale power plants. Design/methodology/approach The suggested SSA approach is aimed to minimize the total fuel cost consumption of power plant considering their generation values as decision variables while satisfying the problem constraints. It confers a solution to the ELD issue by anchoring with foraging behavior of squirrels based on the dynamic jumping and gliding strategies. Furthermore, a heuristic approach and selection rules are used in SSA to handle the constraints appropriately. Findings Empirical results authenticate the superior performance of SSA technique by validating on four different large-scale systems. Comparing SSA with other HOTs, numerical results depict its proficiencies with high-qualitative solution and by its excellent computational efficiency to solve the ELD problems with non-smooth fuel cost function addressing the VPL and MFO. Moreover, the non-parametric tests prove the robustness and efficacy of the suggested SSA and demonstrate that it can be used as a competent optimizer for solving the real-world large-scale non-convex ELD problems. Practical implications This study has compared various HOTs to determine optimal generation scheduling for large-scale ELD problems. Consequently, its comparative analysis will be beneficial to power engineers for accurate generation planning. Originality/value To the best of the authors’ knowledge, this manuscript is the first research work of using SSA approach for solving ELD problems. Consequently, the solution to this problem configures the key contribution of this paper.

Study on Vibration Assisted Heat Transfer for Isonlated Fins

2011 ◽  
Vol 287-290 ◽  
pp. 2364-2368 ◽  
Author(s):  
Kuen Tae Park ◽  
Dong Kwon Kim ◽  
Jin Woo Lee ◽  
Moon G. Lee ◽  
Hyun Jung Kim
Keyword(s):  
Heat Transfer ◽  
Heat Dissipation ◽  
Research Work ◽  
Smart Phone ◽  
Lithium Ion ◽  
Harmonic Excitation ◽  
Energy Deficiency ◽  
Voltage Quality ◽  
Slender Beams ◽  
Efficient Heat Transfer

Energy deficiency and heat generation are key problems for electronics of mobile devices such as smart phone, portable multi-media player, and MP3 player. Generally, they adopt lithium-ion battery which has the degradation of voltage quality and inefficient energy consumption under high temperature caused by heat dissipation from the electronics. The elevated operating temperature makes the battery’s lifetime shorter. To overcome the problems, heat sink with fins are usually attached to the electronic devices for reducing the temperature by efficient heat transfer. The fins are slender beams which can be vibrated easily by transverse force. Therefore, it is possible to increase heat transfer rate by vibrating the fins. Prior research work reported that the transverse vibration results in higher heat dissipation. However, they have focused on not the single isolated fins but the crowded fins. In this paper, the experimental investigation for vibration-assisted isolated fins is presented. The vibration is engaged by a shaker that gives external harmonic excitation force with the wide span of frequency. Also the frequency response of the fin is investigated under a room and elevated temperature of the fin. The heating power and temperature of the fin are measured for the cases with and without vibration. Thermal resistance from the heater to fin is key performance index to evaluate the heat dissipation capability. The effective vibration conditions to enhance the heat transfer are discussed. The result showed that the vibration-assisted fin dissipates more heat from the source than the non vibration-assisted one. Therefore, it can be expected that the vibration-assisted fin can be applied to improve the performance of the mobile electronics and even make longer the battery’s lifetime.

Compact Transient Thermal Model of Microfluidically Cooled Three-Dimensional Stacked Chips With Pin-Fin Enhanced Microgap

2021 ◽  
Vol 143 (3) ◽  
Author(s):  
Yuanchen Hu ◽  
Md Obaidul Hossen ◽  
Zhimin Wan ◽  
Muhannad S. Bakir ◽  
Yogendra Joshi
Keyword(s):  
Heat Transfer ◽  
Integrated Circuit ◽  
High Performance ◽  
Heat Dissipation ◽  
Three Dimensional ◽  
Heat Removal ◽  
Power Estimation ◽  
Leakage Power ◽  
Pin Fin ◽  
Pin Fins

Abstract Three-dimensional (3D) stacked integrated circuit (SIC) chips are one of the most promising technologies to achieve compact, high-performance, and energy-efficient architectures. However, they face a heat dissipation bottleneck due to the increased volumetric heat generation and reduced surface area. Previous work demonstrated that pin-fin enhanced microgap cooling, which provides fluidic cooling between layers could potentially address the heat dissipation challenge. In this paper, a compact multitier pin-fin single-phase liquid cooling model has been established for both steady-state and transient conditions. The model considers heat transfer between layers via pin-fins, as well as the convective heat removal in each tier. Spatially and temporally varying heat flux distribution, or power map, in each tier can be modeled. The cooling fluid can have different pumping power and directions for each tier. The model predictions are compared with detailed simulations using computational fluid dynamics/heat transfer (CFD/HT). The compact model is found to run 120–600 times faster than the CFD/HT model, while providing acceptable accuracy. Actual leakage power estimation is performed in this codesign model, which is an important contribution for codesign of 3D-SICs. For the simulated cases, temperatures could decrease 3% when leakage power estimation is adopted. This model could be used as electrical-thermal codesign tool to optimize thermal management and reduce leakage power.

scholarly journals Thermal Analysis and Optimization of Nano Coated Radiator Tubes Using Computational Fluid Dynamics and Taguchi Method

Coatings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 804
Author(s):  
Sudalai Suresh Pungaiah ◽  
Chidambara Kuttalam Kailasanathan
Keyword(s):  
Heat Transfer ◽  
Fluid Dynamics ◽  
Thermal Analysis ◽  
Computational Fluid Dynamics ◽  
Orthogonal Array ◽  
Heat Dissipation ◽  
Heat Removal ◽  
Taguchi Methods ◽  
Coolant Fluid ◽  
The Impact

Automotive heat removal levels are of high importance for maximizing fuel consumption. Current radiator designs are constrained by air-side impedance, and a large front field must meet the cooling requirements. The enormous demand for powerful engines in smaller hood areas has caused a lack of heat dissipation in the vehicle radiators. As a prediction, exceptional radiators are modest enough to understand coolness and demonstrate great sensitivity to cooling capacity. The working parameters of the nano-coated tubes are studied using Computational Fluid Dynamics (CFD) and Taguchi methods in this article. The CFD and Taguchi methods are used for the design of experiments to analyse the impact of nano-coated radiator parameters and the parameters having a significant impact on the efficiency of the radiator. The CFD and Taguchi methodology studies show that all of the above-mentioned parameters contribute equally to the rate of heat transfer, effectiveness, and overall heat transfer coefficient of the nanocoated radiator tubes. Experimental findings are examined to assess the adequacy of the proposed method. In this study, the coolant fluid was transmitted at three different mass flow rates, at three different coating thicknesses, and coated on the top surface of the radiator tubes. Thermal analysis is performed for three temperatures as heat input conditioning for CFD. The most important parameter for nanocoated radiator tubes is the orthogonal array, followed by the Signal-to-Noise Ratio (SNRA) and the variance analysis (ANOVA). A proper orthogonal array is then selected and tests are carried out. The findings of ANOVA showed 95% confidence and were confirmed in the most significant parameters. The optimal values of the parameters are obtained with the help of the graphs.

scholarly journals Comparative Analysis of Free Natural Convection Heat Transfer on Rectangular and Triangular Fins with and without Perforation

2018 ◽  
Vol 3 (5) ◽  
pp. 60
Author(s):  
Ogie Nosa Andrew ◽  
Joel Oluwayomi Oyejide
Keyword(s):  
Heat Transfer ◽  
Comparative Analysis ◽  
Natural Convection ◽  
Heat Dissipation ◽  
Nuclear Reactors ◽  
Research Work ◽  
Temperature Drop ◽  
Convection Heat Transfer ◽  
Engineering Application ◽  
Cylindrical Pipe

The importance of heat transfer by free natural convection can be found in many engineering application such as energy transfer in buildings, solar collectors, nuclear reactors and electronic packaging.  In this research work, we carried out the investigation and comparative analysis of heat transfer by natural convection on rectangular and triangular fins with and without circular perforation. A total of six (6) specimens were used.  Other materials that were used in this research work include four digital thermometers, one heating element, four thermocouple K-type and a power source.   The fins used in this research work were welded to a cylindrical pipe which served as the heat sink. The heat supplied was maintained at 2500C and the temperature drop through the fin was recorded for duration of 30minutes with intervals of 5minutes. It was observed that the temperature dropped more rapidly with the triangular fins than the rectangular fin. Also, the rate of heat dissipation increase with a corresponding increase in the number of perforation.

scholarly journals Cooling of a battery pack of a car, working on renewable energy

2018 ◽  
Vol 245 ◽  
pp. 15003 ◽  
Author(s):  
Ivan Kasatkin ◽  
Mikle Egorov ◽  
Evgeny Kotov ◽  
Evgeny Zakhlebaev
Keyword(s):  
Heat Transfer ◽  
Heat Dissipation ◽  
Heat Removal ◽  
Lithium Ion ◽  
Operating Mode ◽  
Engineering Calculation ◽  
Electrical Circuit ◽  
Thermal Engineering ◽  
Air Cooling ◽  
Forced Air

The aim of the work is to choose a method of a solar car battery cooling. The student engineering team of Peter the Great Petersburg Polytechnic University designs the car. The analysis of the electrical circuit of the battery is carried out, the heat release is estimated due to three factors. According to the conditions of reliable operation of the battery, it is necessary to maintain its temperature range below 45°C, which requires cooling. The paper analyzes the possibilities of liquid, air-cooling, compares the free and forced methods of convective heat transfer. For the normal operating mode of the electric vehicle, environmental temperature at the level up to 38°C, a criterion thermal engineering calculation of the forced air-cooling of the corridor assembly of 405 battery cells providing the required heat dissipation is performed. It is shown that relatively high values of the heat transfer coefficient are provided under turbulent flow conditions characterized by Reynolds criteria above 103. On the basis of an analysis of the steady-state stationary heat-removal regime, it was concluded that an air flow provides a temperature gradient, sufficient for cooling the lithium-ion battery of a Solar Car «Polytech Solar».

Acoustic Shape Optimization Using Parametric Finite Elements

1995 ◽  
Author(s):  
John E. Huff ◽  
Robert J. Bernhard
Keyword(s):  
Finite Elements ◽  
Shape Optimization ◽  
Optimization Technique ◽  
Computational Cost ◽  
Optimal Solution ◽  
Design Sensitivity ◽  
Single Frequency ◽  
The Novel ◽  
One Dimensional ◽  
Acoustic Enclosures

Abstract A procedure for shape optimization of acoustic enclosures using parametric finite elements is presented. Use of this method facilitates both design sensitivity calculations and the automation of the optimization process. The parametric finite elements can also be used to achieve a reduction of the computational cost of finding the optimal solution for a design problem. The method is verified using a model of a one dimensional, driven acoustic duct. The optimization technique is then applied to a sample problem of the reduction of the sound pressure level inside a two dimensional model of an automobile interior. The optimization is done for both a single frequency and a frequency band. The novel aspects of the use of parametrically defined finite elements and the merits of the method are discussed.

Heat Transfer Studies in Thermally Conducting and Electrically Insulating Nano-Oils in a Natural Circulation Loop

2013 ◽  
Author(s):  
Manu Mohan ◽  
Shijo Thomas ◽  
J. Taha-Tijerina ◽  
T. N. Narayanan ◽  
C. B. Sobhan ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Dissipation ◽  
Power Transmission ◽  
Hexagonal Boron Nitride ◽  
Natural Circulation ◽  
Heat Removal ◽  
Power Transmission Systems ◽  
The Stability ◽  
Thermally Conducting ◽  
2D Nanosheets

Mineral oil (MO), a dielectric insulating fluid, is commonly used as coolant and lubricant in various applications, such as in high voltage power transmission systems and machinery. The mode of heat transfer in most of these systems is natural convection. Prolonged operation at higher temperatures leads to the degradation of the dielectric coolant, which leads to diverse problems, such as shortage or breakdown of these devices and apparatuses. Increasing the heat transfer capability of the insulating fluid will minimize the energy consumption of the system, prolonging its useful life. It is proposed to improve the heat transfer performance of insulating fluid by the addition of hexagonal boron nitride (h-BN), which is synthesized and finally obtained in 2D-nanosheets through wet exfoliation technique, without affecting its electrical insulating property. h-BN was reported to have superb effect on thermal conductivity of MO (∼ 80% increase at 0.10wt.%) on addition at very low filler fraction [1], thermal stability of up to 800°C [2], and good electrical insulating properties due to its nature (electron band gap of approx. 4.5eV). The present work reports the application of nano-oil (MO + h-BN 2D-nanosheets) for enhanced heat dissipation. A rectangular thermosyphon loop was modeled as the thermal system in transformer. The aspect ratio of the loop and the positions of the heater and cooler were chosen according to the stability criterion so that the flow remains stable and unidirectional throughout the experiment. The effect on heat removal by varying the concentration of h-BN 2D-nanosheets (h-BNNS) in MO was measured and discussed.

Heat Transfer Studies in Ejector-induced Downflow Bubble Column

2016 ◽  
Vol 14 (5) ◽  
pp. 955-964
Author(s):  
Rohit B. Meshram ◽  
Gautam Kundu ◽  
Dibyendu Mukherjee
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Liquid Velocity ◽  
Bubble Column ◽  
Research Work ◽  
Experimental Studies ◽  
Heat Removal ◽  
Axial Position ◽  
The Heat Transfer Coefficient

Abstract Temperature control in bubble columns is of great importance, since chemical reactions in many of the chemical, pharmaceutical, fertilizer, etc. industries are usually accompanied by heat supply or heat removal operations. In the present research work, the heat transfer coefficient of a two-phase co-current vertical downflow bubble column (i.d. 0.05 m×1.6 m height) was evaluated. Experimental studies were carried out to calculate the heat transfer coefficient for operating temperature ranges from 60 °C to 90 °C. The effects of the superficial gas velocity (4.25×10–3 to 9.58×10–3 m/s), liquid velocity (8.50×10–2 to 16.98×10–2 m/s), gas holdup, and axial position were investigated. Empirical correlation was developed, based on a multiple regression analysis to calculate a heat transfer coefficient as a function of dimensionless numbers, including the Reynolds number, the Prandtl number, and the Froude number.

Steady and Unsteady Air Impingement Heat Transfer for Electronics Cooling Applications

2013 ◽  
Vol 135 (11) ◽  
Author(s):  
Mehmet Arik ◽  
Rajdeep Sharma ◽  
Jason Lustbader ◽  
Xin He
Keyword(s):  
Heat Transfer ◽  
Heated Surface ◽  
Heat Removal ◽  
Synthetic Jets ◽  
Pulsating Flow ◽  
Coefficient Of Performance ◽  
Superior Performance ◽  
Number Range ◽  
Impingement Heat Transfer ◽  
Steady Jets

This paper focuses on two forced convection methods—steady jet flow and pulsating flow by synthetic jets—that can be used in applications requiring significant amounts of heat removal from electronics components. Given the dearth of available data, we have experimentally investigated steady jets and piezoelectrically driven synthetic jets that provide pulsating flow of air at a high coefficient of performance. To mimic a typical electronics component, a 25.4-mm × 25.4-mm vertical heated surface was used for heat removal. The impingement heat transfer, in the form of Nusselt number, is reported for both steady and unsteady jets over Reynolds numbers from 100 to 3000. The effect of jet-to-plate surface distance on the impingement heat transfer is also investigated. Our results show that synthetic jets can provide significantly higher cooling than steady jets in the Reynolds number range of 100 to 3000. We attribute the superior performance of synthetic jets to vortex shedding associated with the unsteady flow.

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