Molecular Cooling Fan: Factors for Optimization of Heat Dissipation Devices and Applications

2014 ◽  
Vol 53 (50) ◽  
pp. 19550-19558 ◽  
Author(s):  
Tsehaye Eyassu ◽  
Tun-Jen Hsiao ◽  
Kimberly Henderson ◽  
Taesam Kim ◽  
Chhiu-Tsu Lin
Keyword(s):  
Heat Dissipation ◽  
Cooling Fan ◽  
Molecular Cooling

scholarly journals Automobile Radiator’s Engineering and Analysation

2020 ◽  
Vol 9 (5) ◽  
pp. 554-558
Keyword(s):  
Flow Rate ◽  
Heat Dissipation ◽  
Cooling System ◽  
Volume Flow Rate ◽  
Air Flow ◽  
Temperature Drop ◽  
Inlet Temperature ◽  
Air Flow Rate ◽  
Air Velocity ◽  
Cooling Fan

The shape of a radiator cover is crucial either in determining the pattern of air flow or in increasing the same through the radiator core thereby increasing the thermal efficiency, thus making it a necessity to understand it. Moreover the parts circumjacent to the core namely the upper tank, lower tank, cooling fan, fins, tubes, etc promote the air flow rate. Also it is to note that the air flow rate of discharge gases from radiator core is one of the prime factors in determining the automobile cooling system. Initially factors such as temperature, pressure, air flow rate that affect the performance are obtained in order to derive out the entities of operation. One of the observations that can be made through this paper is that as the volume of the coolant increases, the rate of heat dissipation increases, also parameters like inlet temperature and volume flow rate of coolant, air velocity, temperature drop and drop in pressure of coolant are factors that contribute in radiator performance evidently.

Study on the Influence of Inlet Asymmetry on Aerodynamic Noise of Cooling Fan

2020 ◽  
Author(s):  
Jie Tian ◽  
Zonghan Sun ◽  
Pengfei Chai ◽  
Hua Ouyang
Keyword(s):  
Heat Dissipation ◽  
Electronic Device ◽  
Numerical Study ◽  
Rotor Blades ◽  
Aerodynamic Noise ◽  
Sampling Point ◽  
Inlet Flow ◽  
Cooling Fan ◽  
Noise Characteristics ◽  
Correction Technique

Abstract Experimental and numerical studies on the aerodynamic noise characteristics of a variable-speed axial fan commonly used for electronic device heat dissipation were conducted. First, the far-field noise spectrum of the fan was measured using a microphone array on the contour plane of the fan axis. The spectral analysis indicated that the discrete single-tone noise energy ratio was high, which indicates that it was the dominant aerodynamic noise. Afterwards, the double-uniform sampling point mode correction technique, which is based on the circumferential acoustic mode measurement method, was used to obtain the modal distribution on the inlet and outlet sides of the cooling fan. The influence of inlet unevenness on the cooling fan was identified. The traditional Tyler-Sofrin rotor-stator interaction formula was modified to account for the non-axisymmetric shape of the fan inlet bellmouth. The validity of the modified formula was verified by measuring the circumferential acoustic modes of three cooling fans with different rotor and strut counts. Furthermore, a CFD numerical study was conducted using Fluent to understand the influence of uneven inlet flow. The results showed that uneven inlet flow significantly affects the size and distribution of unsteady pulses on the rotor blades, which cause regular, periodic changes as the rotor blades rotate. Interactions between rotor blades and inlet unevenness were observed via the POD method as well. The discussion of the circumferential modes from aerodynamic noise of an axial flow cooling fan can act as a reference for further cooling fan noise reduction measures.

Study on the Influence of Inlet Asymmetry on Aerodynamic Noise of Cooling Fan

2020 ◽  
Vol 142 (12) ◽  
Author(s):  
Jie Tian ◽  
Zonghan Sun ◽  
Pengfei Chai ◽  
Hua Ouyang
Keyword(s):  
Heat Dissipation ◽  
Electronic Device ◽  
Numerical Study ◽  
Rotor Blades ◽  
Aerodynamic Noise ◽  
Sampling Point ◽  
Inlet Flow ◽  
Cooling Fan ◽  
Noise Characteristics ◽  
Correction Technique

Abstract Experimental and numerical studies on the aerodynamic noise characteristics of a variable-speed axial fan commonly used for electronic device heat dissipation were conducted. First, the far-field noise spectrum of the fan was measured using a microphone on the contour plane of the fan axis. The spectral analysis indicated that the discrete single-tone noise energy ratio was high, which indicates that it was the dominant aerodynamic noise. Afterward, the double-uniform sampling point mode correction technique, which is based on the circumferential acoustic mode measurement method, was used to obtain the modal distribution on the inlet and outlet sides of the cooling fan. The influence of inlet unevenness on the cooling fan was identified. The traditional Tyler–Sofrin rotor–stator interaction formula was modified to account for the nonaxisymmetric shape of the fan inlet bellmouth. The validity of the modified formula was verified by measuring the circumferential acoustic modes of three cooling fans with different rotor and strut counts. Furthermore, a computational fluid dynamics (CFD) numerical study was conducted using Fluent to understand the influence of uneven inlet flow. The results showed that uneven inlet flow significantly affects the size and distribution of unsteady pulses on the rotor blades, which cause regular, periodic changes as the rotor blades rotate. Interactions between rotor blades and inlet unevenness were observed via the proper orthogonal decomposition (POD) method as well. The discussion of the circumferential modes from aerodynamic noise of an axial flow cooling fan can act as a reference for further cooling fan noise reduction measures.

scholarly journals Experimental Investigation of a Lithium Battery Cooling System

2019 ◽  
Vol 11 (18) ◽  
pp. 5020 ◽  
Author(s):  
Lijun Zhao ◽  
Jianfeng Wang ◽  
Ying Li ◽  
Qinghe Liu ◽  
Weihua Li
Keyword(s):  
Thermal Model ◽  
Heat Dissipation ◽  
Cooling System ◽  
Maximum Error ◽  
Experimental Results ◽  
Maximum Temperature ◽  
Maximum Temperature Difference ◽  
Battery System ◽  
Cooling Fan ◽  
Heat Transfer Theory

To improve the heat dissipation performance of power batteries in electric racing cars in the Formula Student Electric China (FSEC), a battery cooling system was researched. A battery thermal model and a temperature experimental platform were established. The thermal model was verified by comparing the results of the ANSYS/Workbench simulations with the experimental results, and the maximum error was 7.2%. Based on the FSEC dynamic conditions, the cooling demand was analyzed according to the heat transfer theory. Then, an orthogonal method was used to optimize the position of the cooling fan and the arrangement of the cells, and a parameterized battery simulation model based on ANSYS/Icepak was established. The simulation results show that the maximum temperature difference was optimized by 38.35%. The results of the simulation were in good agreement with the experimental results, and the maximum error was less than 2 °C. This indicates that this design can ensure a car battery system that has a good heat dissipation performance in the FSEC; thus, the intended goal was achieved.

Research on Speed Control Model with Temperature in Hydraulically-Driven Cooling Fan

2013 ◽  
Vol 850-851 ◽  
pp. 350-354
Author(s):  
Yang Wu ◽  
Si Cheng Qin ◽  
Xue Lin Zhang ◽  
Xin Feng ◽  
Bin Bin Chen
Keyword(s):  
Heat Dissipation ◽  
Performance Test ◽  
Static Pressure ◽  
Cooling Power ◽  
Cooling Fan ◽  
Cooling Module ◽  
Fan Speed ◽  
And Performance ◽  
Dissipation Power ◽  
The Mathematical Model

In order to obtain excellent cooling module, it is necessary to make air flow flowing into the radiator vary with ambient temperature. Cooling fan speed must vary with cooling power continuously. In this paper, the relation was obtained between fan speed and flow, static pressure, torque, power based on calculation and performance test data related to cooling fan. The mathematical model between fan speed and heat dissipation power in cooling module was deduced. Driving characteristics of cooling fan were analyzed.

scholarly journals Heat Dissipation Performance of Loader-Digger Cooling System based on Simulation and Test Data

2020 ◽  
Author(s):  
Lei Li ◽  
Xi Chen ◽  
Di Liu ◽  
Hong-gen Zhou ◽  
Haiyan Wu
Keyword(s):  
Flow Field ◽  
Heat Dissipation ◽  
Cooling System ◽  
Internal Flow ◽  
Torque Converter ◽  
Balance Test ◽  
Cooling Fan ◽  
Cooling Chamber ◽  
Flow Field Characteristics ◽  
Air Cooler

Abstract High temperature of the radiator group is harmful to the power system and hydraulic system. In order to improve the heat dissipation performance of the loader, the flow field characteristics of the cooling chamber are analyzed by simulation and heat balance test. Firstly, the mathematical model of heat flow is established. Secondly, the flow field in the cooling chamber under different speeds is simulated based on CFX. And then the influence of fan position and internal flow field distribution on radiator performance is studied. Through the simulation of four different distances, it is concluded that the optimal distance between cooling fan and radiator is 76mm. Finally, a testing system is built for the temperature acquisition of engine water radiator, torque converter oil radiator, hydraulic oil radiator and air-to-air cooler of the hood structure, and then the simulation results are verified. The test results show that the heat dissipation performance of the whole machine meets the requirements after optimization, and the optimized scheme can make the loader-digger in an efficient and energy-saving operation state.

Heat Sink Cooling Fan and Rotation Speed Effect Analysis on Heat Dissipation of High Power GaN LED Package

2014 ◽  
Vol 1082 ◽  
pp. 315-318
Author(s):  
Rajendaran Vairavan ◽  
Vithyacharan Retnasamy ◽  
Zaliman Sauli ◽  
Hussin Kamarudin ◽  
Muammar Mohamad Isa ◽  
...  
Keyword(s):  
Thermal Resistance ◽  
High Power ◽  
Heat Sink ◽  
Heat Dissipation ◽  
Rotation Speed ◽  
Junction Temperature ◽  
Von Mises Stress ◽  
Cooling Fan ◽  
High Power Led ◽  
Von Mises

In this work, thermal simulation analysis on high power LED is reported where the effect of the heat sink cooling fan and its rotation speed on the heat dissipation of the high power LED was evaluated. Ansys version 11 was utilized for the simulation. The thermal performance of the high power LED package was assessed in terms of operating junction temperature, von Mises stress and thermal resistance. The heat dissipation analysis was done under four types of convection condition:one natural convection conditionthree forced convection condition,. The forced convection condition was used to replicate the effect of a fan with various rotation speeds placed under the heat sink to increase the convective heat transfer coefficient. Results of the analysis showed that that the junction temperature, von Mises stress and thermal resistance of the GaN chip reduces with the increase of the fan rotation speed.

Experimental study on the effect of different components collocations on flow of automotive cooling fan

2019 ◽  
Vol 234 (1) ◽  
pp. 270-282 ◽  
Author(s):  
Suping Wen ◽  
Yuwei Hao ◽  
Zhixuan Zhang ◽  
Yifei Wang
Keyword(s):  
Flow Field ◽  
Flow Structure ◽  
Heat Dissipation ◽  
Cooling System ◽  
Flow Data ◽  
Engine Cooling ◽  
Cooling Fan ◽  
Downstream Region ◽  
Piv Measurement ◽  
Series Of Experiments

The flow structure in the downstream region of the cooling fan has great impact on engine heat dissipation. An integrated PIV measurement system was designed and constructed to understand the flow field behind the cooling fan. In order to analyze the influence of interaction of different components on flow structure in downstream region, a series of experiments were conducted in four arrangements at three flow coefficients. The flow field was evaluated by velocity profile, vorticity, and turbulent intensity. These flow data reflect the effect of isolated components and their combinations quantitatively. This work provides useful information for engine cooling system design.

Sign in / Sign up

Export Citation Format

Share Document