scholarly journals HEAT TRANSFER ANALYSIS AND DESIGN OF A PLUGGING INDICATOR SYSTEM FOR SRE

1955 ◽  
Author(s):  
H L Sletten
Keyword(s):  
Heat Transfer ◽  
Indicator System ◽  
Heat Transfer Analysis ◽  
Analysis And Design

A 3D SHAPE OPTIMIZATION PROBLEM IN HEAT TRANSFER: ANALYSIS AND APPROXIMATION VIA BEM

2006 ◽  
Vol 16 (08) ◽  
pp. 1243-1270 ◽  
Author(s):  
ANTONELLA ABBÀ ◽  
FAUSTO SALERI ◽  
CARLO D'ANGELO
Keyword(s):  
Heat Transfer ◽  
Shape Control ◽  
Adjoint Equation ◽  
Optimal Shape ◽  
Heat Transfer Analysis ◽  
Industrial Plant ◽  
Flame Surface ◽  
Cost Functional ◽  
Analysis And Design ◽  
Flame Shape

In this paper an optimal shape control problem dealing with heat transfer in enclosures is studied. We have considered an enclosure heated by a flame surface (taking into account radiation, conduction and convection effects), and we look for an optimal flame shape which minimizes a cost functional defined on the temperature field. This kind of problem arises in industrial furnaces optimization, as temperature uniformity is one of the most important aspects in industrial plant analysis and design. Analytical results (smoothness of the control-to-state mapping, existence of an optimal shape in a certain admissible class) as well as numerical optimization results by the boundary element method have been obtained; we have employed the gradient method to optimize the flame shape, exploiting the adjoint equation associated with our state equation and cost functional.

Conjugate Heat Transfer Analysis and Design Optimization of Internally Cooling Turbine Blade

2011 ◽  
Vol 148-149 ◽  
pp. 862-867
Author(s):  
Mao Hua Qu ◽  
Su Ya Sun ◽  
Ping Xi
Keyword(s):  
Heat Transfer ◽  
Design Optimization ◽  
Turbine Blade ◽  
Conjugate Heat Transfer ◽  
Parametric Modeling ◽  
Heat Transfer Analysis ◽  
Coupled Analysis ◽  
Cooling Efficiency ◽  
Analysis And Design ◽  
Combined Algorithm

To improve the cooling efficiency of turbine blade, a multidisciplinary design optimization (MDO) system involving aerodynamics, heat transfer and structures has been developed. In this system, a MDO procedure for a turbine blade with complicate internal structure is performed. The structural size of rib turbulators, partitions and trailing edge cooling slots, which serve as design variables, is used for parametric modeling of three dimensional turbine blade. Conjugate heat transfer analysis is employed to get the temperature of the blade. The temperature in the blade body obtained from former coupled analysis is specified as boundary conditions for structural analysis. Meanwhile, a combined algorithm of multi-island genetic algorithm (MIGA) and sequential quadratic programming (SQP) is applied for optimization in specified space. While the flow rate of cooling air remains unchanged, the maximum and average temperatures of the blade decrease under the condition of meeting the strength requirement. The result shows that the cooling efficiency of turbine blade is improved, and the system exhibits higher stability, feasibility and efficiency for engineering applications.

scholarly journals Heat Transfer in Health and Healing1

2015 ◽  
Vol 137 (10) ◽  
Author(s):  
Kenneth R. Diller
Keyword(s):  
Heat Transfer ◽  
Personal Control ◽  
The Body ◽  
Heat Transfer Analysis ◽  
Control Surface ◽  
Body Core Temperature ◽  
Temperature Control System ◽  
Temperature Modulation ◽  
Analysis And Design ◽  
Anesthetic Agents

Our bodies depend on an exquisitely sensitive and refined temperature control system to maintain a state of health and homeostasis. The exceptionally broad range of physical activities that humans engage in and the diverse array of environmental conditions we face require remarkable strategies and mechanisms for regulating internal and external heat transfer processes. On the occasions for which the body suffers trauma, therapeutic temperature modulation is often the approach of choice for reversing injury and inflammation and launching a cascade of healing. The focus of human thermoregulation is maintenance of the body core temperature within a tight range of values, even as internal rates of energy generation may vary over an order of magnitude, environmental convection, and radiation heat loads may undergo large changes in the absence of any significant personal control, surface insulation may be added or removed, all occurring while the body's internal thermostat follows a diurnal circadian cycle that may be altered by illness and anesthetic agents. An advanced level of understanding of the complex physiological function and control of the human body may be combined with skill in heat transfer analysis and design to develop life-saving and injury-healing medical devices. This paper will describe some of the challenges and conquests the author has experienced related to the practice of heat transfer for maintenance of health and enhancement of healing processes.

Heat Transfer Analysis and Design Optimization of ALOX High Brightness Light Emitting Diode Package

2007 ◽  
Author(s):  
Shan Gao ◽  
Jupyo Hong ◽  
Sanghyun Choi ◽  
Seogmoon Choi ◽  
Sung Yi
Keyword(s):  
Heat Transfer ◽  
Thermal Properties ◽  
Thermal Resistance ◽  
Light Emitting Diode ◽  
Aluminum Substrate ◽  
Heat Transfer Analysis ◽  
Flux Analysis ◽  
High Brightness ◽  
Light Emitting ◽  
Analysis And Design

High Brightness (HB) Light emitting diode (LED) technology is becoming the choice for many lighting applications. However, one potential problem with LED based lighting systems is the thermal issue during service, which has restricted LED in the application of mini-devices. In this study, thermal performance of Al2O3 (ALOX) based HBLED package is considered. Steady state heat transfer analysis is carried out using 3-D finite element method (FEM). A new algorithm has firstly been developed, which combines FEM analysis and thermal transient experimental investigation, to determine the interfacial thermal properties of the package. Then the interfacial thermal properties are applied in the FEM model for heat transfer analysis. Temperature distribution and heat flux analysis are calculated and thermal resistance of the package is determined based on the FEM simulation. The results show that die attachment (solder material) plays the most important role in the thermal resistance of the ALOX package, i.e., it takes about 80% of the total thermal resistance. In addition, thermal resistance of the package is mainly caused by the interfacial thermal resistances, the behavior of which depends strongly on manufacturing processes. The parametric study shows that Al2O3 isolation ring increases the thermal resistance of the package because it creates an interface inside the aluminum substrate. Pure Aluminum substrate achieves a better performance in the respect of thermal behavior of packaging designs.

Flow and Heat Transfer Computations in a Rotating Cavity With Tangential Seal Air Flow

1997 ◽  
Author(s):  
Prabhat Tekriwal
Keyword(s):  
Heat Transfer ◽  
Air Flow ◽  
Three Dimensional ◽  
Thermomechanical Analysis ◽  
Heat Transfer Analysis ◽  
Symmetric Model ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Life Study ◽  
Analysis And Design

Axi-symmetric and three-dimensional CFD models for a rotating open interdisk cavity have been developed to predict flow, heat transfer, windage power loss and cavity air temperatures as a part of the rotor thermomechanical analysis and design life study. The cavity has a tangential (axial and circumferential) seal air flow above it. The rotational Reynolds number is 4.8 × 106 and the non-dimensional seal flow rate is 9.8 × 104. Measured wall temperatures are used as boundary conditions in the model. The axi-symmetric model smears the cavity bolts as 360° continuous rings and therefore ignores the bolts pumping effect. The windage loss calculation from the axi-symmetric model is in good agreement with the experimental data in the literature. The heat transfer coefficient values from the axi-symmetric and three-dimensional models are comparable in most of the regions apart from near the bolts. Also, the three-dimensional model simulates the bolt pumping effects and yields a much higher windage loss value, which in turn raises the cavity air temperature. It is concluded that a three-dimensional model is necessary for an accurate heat transfer analysis.

Computational Heat Transfer Analysis and Design of Third-World Cookstoves

2009 ◽  
Author(s):  
Alex Wohlgemuth ◽  
Sandip Mazumder ◽  
Dale Andreatta
Keyword(s):  
Heat Transfer ◽  
Thermal Efficiency ◽  
Third World ◽  
Operating Conditions ◽  
Heat Transfer Analysis ◽  
Vertical Position ◽  
Conducting Material ◽  
Unknown Parameters ◽  
Analysis And Design ◽  
Computational Fluid Dynamics Cfd

In many developing countries, natural gas, wood, or biomass fired cookstoves find prolific usage. These cookstoves are constructed without paying much too attention to their thermal efficiency. In this study, a computational heat transfer analysis of a generic third-world cookstove is conducted with the goal to understand the effect of various operating conditions and geometric parameters on the overall heat transfer characteristics and thermal efficiency. A Computational Fluid Dynamics (CFD) model, including turbulence and heat transfer by all three modes, was first created. The model was first validated against experimental data, also collected as part of this study. Unknown parameters in the model were calibrated to better match experimental observations. It is generally believed that placing a skirt around the stove and cook-pot enhances thermal efficiency. The model was explored to study the effects several skirt-related parameters. These include the vertical position of the skirt, the width of the gap between the skirt and the cook-pot, and the thermal conductivity of the skirt (insulating vs. conducting material). It was found that the skirt must either be made out of an insulating material or insulated on the outer surface for it to provide maximum benefits. It was also found that it must be placed at an optimum distance away from the cook-pot for maximum thermal efficiency.

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