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Keywords: Roughness
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Journal Articles
Article Type: Research-Article
J. Heat Transfer. April 2021, 143(4): 042801.
Paper No: HT-20-1285
Published Online: February 22, 2021
... characteristics, e.g., surface roughness, surface damage, oxide layers, and deposited thin films, and cannot be assumed as those of pure materials, typically referred to optically smooth surfaces (OS). An experimental investigation of the thermal emittance of some metals (nickel, titanium, silver, and stainless...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. February 2021, 143(2): 021604.
Paper No: HT-20-1300
Published Online: December 21, 2020
.... The optical profiler (NPFLEX, Bruker, MA) was used to measure the roughness ratio ( a ) and average surface roughness of both residue and copper surfaces with highest standard deviation of 0.017 and 0.094  μ m, respectively. Both roughness parameters were measured three times at different substrate locations...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. September 2020, 142(9): 091601.
Paper No: HT-19-1400
Published Online: June 12, 2020
..., experimental results of heat transfer coefficients (HTCs) during pool boiling of de-ionized water (DI water), Al 2 O 3 -DI water- and Fe 2 O 3 -DI water-based nanofluids are presented in this paper. Based on these results, the effect of surface roughness and nanofluid concentration on the surface wettability...
Includes: Supplementary data
Journal Articles
Article Type: Research-Article
J. Heat Transfer. March 2020, 142(3): 032503.
Paper No: HT-19-1645
Published Online: January 29, 2020
... by the distance between the two walls. In the same way, the effect of wall roughness on the thermal conductivity is investigated, which shows that roughness is effective only for low distances between the walls. Also, the thermal conductivity of argon under Poiseuille flow in a nanochannel is studied. The results...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. January 2020, 142(1): 012102.
Paper No: HT-19-1197
Published Online: November 11, 2019
...Viet-Dung Nguyen; Philippe Dufrénoy; Patrice Coorevits The objective of this study focuses on the energy dissipation by friction on the interface of a braking system and the effects of roughness and granular plateaus on heat propagation. Faced with the difficulty of defining velocity accommodation...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. October 2013, 135(10): 101005.
Paper No: HT-12-1329
Published Online: September 11, 2013
...Olga Rovenskaya; Giulio Croce 29 06 2012 26 02 2013 A numerical analysis of the flow field in rough microchannel is carried out decomposing the computational physical domain into kinetic and continuum subdomains. Each domain size is determined by the value of a proper threshold...
Journal Articles
Article Type: Forced Convection
J. Heat Transfer. October 2012, 134(10): 101701.
Published Online: August 7, 2012
...Ting-Yu Lin; Satish G. Kandlikar The effect of structured roughness on the heat transfer of water flowing through minichannels was experimentally investigated in this study. The test channels were formed by two 12.7 mm wide × 94.6 mm long stainless steel strips. Eight structured roughness elements...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. April 2010, 132(4): 041001.
Published Online: February 17, 2010
...Zhipeng Duan; Y. S. Muzychka The effect of axial corrugated surface roughness on fully developed laminar flow in microtubes is investigated. The radius of a microtube varies with the axial distance due to corrugated roughness. The Stokes equation is solved using a perturbation method with slip...
Journal Articles
Article Type: Micro/Nanoscale Heat Transfer—Part I
J. Heat Transfer. March 2009, 131(3): 033107.
Published Online: January 21, 2009
... roughness. The new all-liquid and all-vapor data are successfully compared against predictions of single-phase flow models. Also the two-phase flow data are compared against a model previously developed by the present authors for adiabatic flow or flow during condensation of halogenated refrigerants inside...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. August 2008, 130(8): 081301.
Published Online: May 30, 2008
...Robert L. Jackson; Sushil H. Bhavnani; Timothy P. Ferguson A new multiscale model of thermal contact resistance (TCR) between real rough surfaces is presented, which builds on Archard’s multiscale description of surface roughness. The objective of this work is to construct the new model and use...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. December 2004, 126(6): 985–993.
Published Online: January 26, 2005
...Q. Z. Zhu; Z. M. Zhang Both one-dimensional (1D) and two-dimensional (2D) slope distributions were obtained from the surface topographic data, measured using an atomic force microscope for a rough silicon surface. The resulted slope distributions deviate significantly from the Gaussian distribution...
Journal Articles
Article Type: Technical Papers
J. Heat Transfer. October 2004, 126(5): 753–763.
Published Online: November 16, 2004
...Stephen E. Turner; Lok C. Lam; Mohammad Faghri; Otto J. Gregory This paper presents an experimental investigation of laminar gas flow through microchannels. The independent variables: relative surface roughness, Knudsen number and Mach number were systematically varied to determine their influence...
Journal Articles
Article Type: Technical Notes
J. Heat Transfer. August 2004, 126(4): 652–655.
Published Online: May 14, 2004
... contact resistance 8 9 . Thermal constriction is an important phenomenon which occurs at the interface of two solids due to surface defects (flatness, roughness of first, second order…). This phenomenon is modeled by a thermal constriction resistance...
Journal Articles
Article Type: Technical Papers
J. Heat Transfer. April 2004, 126(2): 193–201.
Published Online: May 4, 2004
... slightly lower or in rough agreement with these data at higher Reynolds numbers. Differences between the present data and the Han et al. 5 parallel-rib data are due to different channel aspect ratios (1 and 4), different rib blockage percentages (12.5 percent and 25.0 percent), and because the Han et al...
Journal Articles
Article Type: Technical Papers
J. Heat Transfer. October 2003, 125(5): 769–778.
Published Online: September 23, 2003
... of temperature ratio and/or variable properties on flow and heat transfer in internal passages. Of these, Dipprey and Sabersky 2 examine the effects of different values of the molecular Prandtl number on heat transfer coefficients and friction factors in tubes with water and closed-packed sand-grain roughness...
Journal Articles
Article Type: Technical Notes
J. Heat Transfer. June 2003, 125(3): 532–535.
Published Online: May 20, 2003
... random processes Contact Resistance Heat Transfer Interface Roughness Tribology The thermal contact resistance was widely studied during these last decades. Several works have been conducted to evaluate its evolution according to the geometrical, mechanical and thermal characteristics...
Journal Articles
Article Type: Technical Papers
J. Heat Transfer. June 2003, 125(3): 394–402.
Published Online: May 20, 2003
...S. Sunil Kumar; K. Ramamurthi The effect of surface roughness, waviness and flatness deviations on thermal contact conductance is predicted. Threshold values of the surface parameters which do not adversely influence thermal contact conductance are determined. Flatness deviations less than ten...
Journal Articles
Article Type: Technical Papers
J. Heat Transfer. June 2003, 125(3): 462–470.
Published Online: May 20, 2003
...Y. H. Zhou; Z. M. Zhang This paper presents a Monte Carlo model for prediction of the radiative properties of semitransparent silicon wafers with rough surfaces. This research was motivated by the need of accurate temperature measurement in rapid thermal processing (RTP) systems. The methods...
Journal Articles
Article Type: Technical Notes
J. Heat Transfer. December 2002, 124(6): 1218–1221.
Published Online: December 3, 2002
.... Neagu , M. , and Bejan , A. , 2001 , “ Constructal Placement of High-Conductivity Inserts in a Slab: Optimal Design of Roughness ,” ASME J. Heat Transfer , 123 , pp. 1184 – 1189 . Zienkiewicz, O. C., and Taylor, R. L., 1989, The Finite Element Method , 1 , McGraw-Hill, London...
Journal Articles
Article Type: Technical Papers
J. Heat Transfer. August 2002, 124(4): 617–625.
Published Online: July 16, 2002
... February 2002 16 07 2002 rotational flow flow measurement channel flow heat transfer cooling Enhancement Heat transfer Rotating Roughness Turbines As the world becomes exceedingly industrialized, there develops an ever-increasing demand for energy. Extensive research...