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
G. Yadigaroglu, Arthur E. Bergles
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 t...... hiện toàn bộ
Phase Change Problems With Temperature-Dependent Thermal Conductivity
Journal of Heat Transfer - Tập 96 Số 2 - Trang 214-217 - 1974
S. H. Cho, J. E. Sunderland
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 v...... hiện toàn bộ
A Comparative Study of Flow Boiling in a Microchannel With Piranha Pin Fins
Journal of Heat Transfer - Tập 138 Số 11 - 2016
Xueli Yu, Corey Woodcock, Y. Wang, Joel L. Plawsky, Yoav Peles
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 ...... hiện toàn bộ
Heat Transfer Mechanisms During Flow Boiling in Microchannels
Journal of Heat Transfer - Tập 126 Số 1 - Trang 8-16 - 2004
Satish G. Kandlikar
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 ...... hiện toàn bộ
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
Ben‐Wen Li, Chen Hai-geng, Junhu Zhou, Xinyu Cao, Cen Ke-fa
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 predictio...... hiện toàn bộ
Two-Dimensional Radiation in Absorbing-Emitting Media Using the P-N Approximation
Journal of Heat Transfer - Tập 105 Số 2 - Trang 333-340 - 1983
A. C. Ratzel, John R. Howell
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 approxi...... hiện toàn bộ
Temperature-Dependent Thermal Conductivity of Single-Crystal Silicon Layers in SOI Substrates
Journal of Heat Transfer - Tập 120 Số 1 - Trang 30-36 - 1998
Mehdi Asheghi, Maxat Touzelbaev, Kenneth E. Goodson, Yuet‐Kin Leung, S.S. Wong
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 ...... hiện toàn bộ
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
Carlos J. Gomes, Marcela Madrid, Javier V. Goicochea, Cristina H. Amon
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 ...... hiện toàn bộ
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
Arpit Mittal, Sandip Mazumder
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 predictio...... hiện toàn bộ
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
Gaurav Sharma, S. P. Sukhatme
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...... hiện toàn bộ
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