Influences of Free Stream Conditions on Vehicle Thermal Management – An Analytical Study

2009 ◽  
Author(s):  
Ken T. Lan ◽  
Kumar Srinivasan
Keyword(s):  
Thermal Management ◽  
Analytical Study ◽  
Free Stream

Heat Conduction in Three Dimensional Stacked Packages

2005 ◽  
Author(s):  
Anand Desai ◽  
James Geer ◽  
Bahgat Sammakia
Keyword(s):  
Heat Conduction ◽  
Thermal Management ◽  
Heat Generation ◽  
Analytical Study ◽  
Three Dimensional ◽  
The Other ◽  
Heat Generation Rate ◽  
Potential Applications ◽  
Steady State Heat ◽  
Spatially Varying

This paper presents the results of an analytical study of steady state heat conduction in multiple rectangular domains. Any finite number of such domains may be considered in the current study. The thermal conductivity and thickness of these domains may be different. The entire geometry composed of these connected domains is considered as adiabatic on the lateral surfaces and can be subjected to uniform convective cooling at one end. The other end of the geometry may be adiabatic and a specified, spatially varying heat generation rate can be applied in each of the domains. The solutions are found to be in agreement with known solutions for simpler geometries. The analytical solution presented here is very general in that it takes into account the interface resistances between the layers. One application of this analytical study relates to the thermal management of a 3-D stack of devices and interconnect layers. Another possible application is to the study of hotspots in a chip stack with non uniform heat generation. Many other potential applications may also be simulated.

Analytical Study of Thermal Management: A Case Study of Underhood Configurations

2015 ◽  
Author(s):  
Sandeep Makam ◽  
Christopher Dubbs ◽  
Yeliana Roosien ◽  
Feng Lin ◽  
William Resh
Keyword(s):  
Thermal Management ◽  
Analytical Study

An experimental and analytical study of a variable conductance heat pipe: Application to vehicle thermal management

2012 ◽  
Vol 38 ◽  
pp. 48-57 ◽  
Author(s):  
Maryline Leriche ◽  
Souad Harmand ◽  
Marc Lippert ◽  
Bernard Desmet
Keyword(s):  
Heat Pipe ◽  
Thermal Management ◽  
Analytical Study

Unsteady MHD natural convection flow of a rotating viscoelastic fluid over an infinite vertical porous plate due to oscillating free-stream

2018 ◽  
Vol 14 (2) ◽  
pp. 236-260 ◽  
Author(s):  
Jitendra Kumar Singh ◽  
Gauri Shenker Seth ◽  
Saikh Ghousia Begum
Keyword(s):  
Boundary Layer ◽  
Viscoelastic Fluid ◽  
Analytical Study ◽  
Free Stream ◽  
Porous Plate ◽  
Convection Flow ◽  
Natural Convection Flow ◽  
Content Type ◽  
Vertical Porous Plate ◽  
Ion Slip

Purpose The purpose of this paper is to present an analytical study on an unsteady magnetohydrodynamic (MHD) boundary layer flow of a rotating viscoelastic fluid over an infinite vertical porous plate embedded in a uniform porous medium with oscillating free-stream taking Hall and ion-slip currents into account. The unsteady MHD flow in the rotating fluid system is generated due to the buoyancy forces arising from temperature and concentration differences in the field of gravity and oscillatory movement of the free-stream. Design/methodology/approach The resulting partial differential equations governing the fluid motion are solved analytically using the regular perturbation method by assuming a very small viscoelastic parameter. In order to note the influences of various system parameters and to discuss the important flow features, the numerical results for fluid velocity, temperature and species concentration are computed and depicted graphically vs boundary layer parameter whereas skin friction, Nusselt number and Sherwood number at the plate are computed and presented in tabular form. Findings An interesting observation is recorded that there occurs a reversal flow in the secondary flow direction due to the movement of the free stream. It is also noted that a decrease in the suction parameter gives a rise in momentum, thermal and concentration boundary layer thicknesses. Originality/value Very little research work is reported in the literature on non-Newtonian fluid dynamics where unsteady flow in the system arises due to time-dependent movement of the plate. The motive of the present analytical study is to analyse the influences of Hall and ion-slip currents on unsteady MHD natural convection flow of a rotating viscoelastic fluid (non-Newtonian fluid) over an infinite vertical porous plate embedded in a uniform porous medium with oscillating free-stream.

A study of transonic flow around spheres

1977 ◽  
Vol 80 (1) ◽  
pp. 17-31 ◽  
Author(s):  
K. R. Jaikrishnan ◽  
A. Z. Szeri ◽  
W. M. Rohrer
Keyword(s):  
Transonic Flow ◽  
Analytical Study ◽  
Energy Equation ◽  
Free Stream ◽  
Wet Steam ◽  
Orthogonal Collocation ◽  
Pressure Distributions ◽  
Free Stream Mach Number ◽  
The Relationship ◽  
Theoretical Pressure

The paper presents a new analytical and experimental study of transonic flow around spheres. The results of the analytical study, which employs the method of orthogonal collocation for simultaneous solution of the momentum equations, the equation of continuity and the energy equation, are compared with hitherto unpublished measurements obtained on spheres of various sizes (1·02, 2·54 and 3·81 cm in diameter) in air, in dry steam and in wet steam with free-stream Mach numbers in the transonic range (0·58 <M∞< 0·97). The relationship θh= 91·78 + 8·59M∞between the attached-shock angle and the free-stream Mach number was obtained by fitting the theoretical pressure distributions to the experimental ones.

scholarly journals Drag on an Oscillating Airfoil in a Fluctuating Free Stream

1979 ◽  
Vol 101 (3) ◽  
pp. 391-399 ◽  
Author(s):  
S. B. R. Kottapalli ◽  
G. Alvin Pierce
Keyword(s):  
Boundary Layer ◽  
Analytical Study ◽  
Free Stream ◽  
Time Dependent ◽  
Friction Drag ◽  
Boundary Layer Analysis ◽  
Reduced Frequency ◽  
Layer Analysis ◽  
Flow Pressure ◽  
Oscillating Airfoil

An analytical study is presented regarding the unsteady skin friction drag of an oscillating airfoil exposed to a fluctuating free stream speed. Both laminar and turbulent conditions are covered in the analysis. The unsteady potential flow pressure and velocity distributions required for the subsequent boundary layer analysis are obtained by an approximate development. The time-dependent boundary layer is solved by a finite difference scheme. It was found that depending on the values of the phase difference between free stream fluctuations and airfoil oscillations, reduced frequency, and amplitude of free stream fluctuations, the drag can either lead or lag the free stream.

Sign in / Sign up

Export Citation Format

Share Document