Journal of Heat Transfer
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Fundamental and Higher-Mode Density-Wave Oscillations in Two-Phase Flow
Journal of Heat Transfer - Tập 94 Số 2 - Trang 189-195 - 1972
This paper treats the oscillatory two-phase flow instabilities commonly referred
to as density-wave oscillations. A dynamic analysis of the single-phase region
of a boiling channel, accounting for wall heat capacity and the effect of
pressure variations on the movements of the boiling boundary, is summarized.
Experiments conducted with a Freon-113 channel at atmospheric pressure revealed
the exist...
Phase Change Problems With Temperature-Dependent Thermal Conductivity
Journal of Heat Transfer - Tập 96 Số 2 - Trang 214-217 - 1974
An exact solution is presented for the temperature distribution and phase change
position of a semi-infinite body which is initially at a constant temperature
different from the fusion temperature. The temperature of the free surface is
instantaneously changed and held constant at a value that will cause either
melting or solidification of the body. The thermal conductivity is assumed to
vary line...
Heat Transfer Mechanisms During Flow Boiling in Microchannels
Journal of Heat Transfer - Tập 126 Số 1 - Trang 8-16 - 2004
The forces due to surface tension and momentum change during evaporation, in
conjunction with the forces due to viscous shear and inertia, govern the
two-phase flow patterns and the heat transfer characteristics during flow
boiling in microchannels. These forces are analyzed in this paper, and two new
nondimensional groups, K1 and K2, relevant to flow boiling phenomenon are
derived. These groups a...
A Comparative Study of Flow Boiling in a Microchannel With Piranha Pin Fins
Journal of Heat Transfer - Tập 138 Số 11 - 2016
In this paper, we report on the recent development of an advanced microscale
heat sink, termed as piranha pin fin (PPF). A 200 μm deep microchannel embedded
with PPFs was fabricated and tested. Fluid flow and heat transfer performance
were evaluated with HFE7000 as the working fluid. The surface temperature,
pressure drop, heat transfer coefficient, and critical heat flux (CHF)
conditions were exp...
The Spherical Surface Symmetrical Equal Dividing Angular Quadrature Scheme for Discrete Ordinates Method
Journal of Heat Transfer - Tập 124 Số 3 - Trang 482-490 - 2002
Abstract A new angular quadrature scheme named Spherical surface Symmetrical
equal Dividing (abbreviated to SSDN) is presented. The evaluations of double
moments by SSDN and other traditional quadrature sets show that the new SSDN is
able to provide good accuracy and compete well with others (as for example the
SN and LSN method). Radiative predictions in a black-walled rectangular
enclosure conta...
Two-Dimensional Radiation in Absorbing-Emitting Media Using the P-N Approximation
Journal of Heat Transfer - Tập 105 Số 2 - Trang 333-340 - 1983
Radiative energy transfer in a gray absorbing and emitting medium is considered
in a two-dimensional rectangular enclosure using the P-N differential
approximation. The two-dimensional moment of intensity partial differential
equations (PDE’s) are combined to yield a single second-order PDE for the P-1
approximation and four coupled second-order PDE’s for the P-3 approximation. P-1
approximation r...
Temperature-Dependent Thermal Conductivity of Single-Crystal Silicon Layers in SOI Substrates
Journal of Heat Transfer - Tập 120 Số 1 - Trang 30-36 - 1998
Self heating diminishes the reliability of silicon-on-insulator (SOI)
transistors, particularly those that must withstand electrostatic discharge
(ESD) pulses. This problem is alleviated by lateral thermal conduction in the
silicon device layer, whose thermal conductivity is not known. The present work
develops a technique for measuring this property and provides data for layers in
wafers fabricat...
In-Plane and Out-Of-Plane Thermal Conductivity of Silicon Thin Films Predicted by Molecular Dynamics
Journal of Heat Transfer - Tập 128 Số 11 - Trang 1114-1121 - 2006
The thermal conductivity of silicon thin films is predicted in the directions
parallel and perpendicular to the film surfaces (in-plane and out-of-plane,
respectively) using equilibrium molecular dynamics, the Green-Kubo relation, and
the Stillinger-Weber interatomic potential. Three different boundary conditions
are considered along the film surfaces: frozen atoms, surface potential, and
free bou...
Monte Carlo Study of Phonon Heat Conduction in Silicon Thin Films Including Contributions of Optical Phonons
Journal of Heat Transfer - Tập 132 Số 5 - 2010
Abstract The Monte Carlo method has found prolific use in the solution of the
Boltzmann transport equation for phonons for the prediction of nonequilibrium
heat conduction in crystalline thin films. This paper contributes to the
state-of-the-art by performing a systematic study of the role of the various
phonon modes on thermal conductivity predictions, in particular, optical
phonons. A procedure ...
Combined Free and Forced Convection Heat Transfer From a Heated Tube to a Transverse Air Stream
Journal of Heat Transfer - Tập 91 Số 3 - Trang 457-459 - 1969
Heat transfer by combined free and forced convection from a heated tube to a
transverse air stream has been experimentally studied over a wide range of
Grashof and Reynolds numbers. The data obtained have been correlated with
Gr/Re2.5 as the correlating parameter. Criteria for transition from free
convection to combined convection and from combined convection to forced
convection have also been ob...
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