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Keywords: surface roughness
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Journal Articles
Article Type: Research-Article
J. Heat Transfer. October 2020, 142(10): 102501.
Paper No: HT-20-1158
Published Online: July 16, 2020
...Indrasis Mitra; Indranil Ghosh The effect of surface roughness on the thermohydraulics in minichannels has been studied numerically. Fluid flow (at low Reynolds number) through a typical three-dimensional (3D) channel subjected to constant heat flux (at the bottom) is analyzed incorporating surface...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. September 2015, 137(9): 091007.
Paper No: HT-14-1075
Published Online: September 1, 2015
... = electrical current (A) K f = thermal conductivity of air at film temperature (W/(m K)) l = length of the wire (m) Nu = Nusselt number R w = wire resistance at room temperature (Ω) Ra = average surface roughness (m) Re = Reynolds number...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. September 2015, 137(9): 091006.
Paper No: HT-14-1073
Published Online: September 1, 2015
... 2 K, Δ T  = 15 K) ±1.6% (at 25,000 W/m 2 K, Δ T  = 20 K) Electrode height ±11 μ m Electric field (at −5 kV/mm) ±13% (at 100 μ m) ±4.3% (at 300 μ m) Current ±4.2% (at 1 μ A) ±2.3% (at 7 μ A) Many factors, including the boiling surface roughness, power of the heater...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. March 2014, 136(3): 031501.
Paper No: HT-12-1370
Published Online: November 21, 2013
... enhancement takes place, bar Pr = Prandtl number q = heat flux, W/m 2 R a = surface roughness, μ m R b = bubble radius, μ m R e = equilibrium radius, μ m T = temperature, °C Δ T w = wall superheat, °C Greek Symbols β = crevice angle...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. August 2013, 135(8): 081901.
Paper No: HT-12-1343
Published Online: June 27, 2013
... cooling, etc. A variety of techniques [ 1 ] for heat transfer enhancement have been developed, including ribs [ 2–6 ], pin fins [ 7–9 ], dimpled surfaces [ 10–12 ], surfaces with arrays of protrusions [ 13 ], and surface roughness. All of these devices not only act to increase secondary flows...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. May 2012, 134(5): 051011.
Published Online: April 13, 2012
.... ,and Kandlikar , S. G. , 2006 , “ Characterization of the Effect of Surface Roughness and Texture on Fluid Flow: Past, Present, and Future ,” Int. J. Therm. Sci. , 45 ( 10 ), pp. 962 – 968 . 10.1016/j.ijthermalsci.2006.01.004 2 Kandlikar , S. G. , 2008 , “ Exploring Roughness Effect...
Journal Articles
Article Type: Heat Transfer In Nanochannels, Microchannels, And Minichannels
J. Heat Transfer. February 2012, 134(2): 020909.
Published Online: December 19, 2011
..., 67.2 °C, and 80.2 °C. At each pressure, jet impingement boiling at varying Reynolds numbers are characterized and compared with pool boiling heat transfer. The effect of surface roughness and fluid subcooling is studied at the lowest pressure of 0.176 bar. Boiling curves indicate a strong dependence...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. February 2012, 134(2): 021501.
Published Online: December 9, 2011
... heat transfer performance of steam-air mixture on a roughness-induced superhydrophobic SAM-1 surface. 18 05 2010 23 08 2011 09 12 2011 09 12 2011 air condensation contact angle drops heat transfer hydrophobicity steam surface roughness wetting dropwise...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. November 2011, 133(11): 111501.
Published Online: August 31, 2011
... trend has been observed with variation in the surface roughness of the heater as well. boiling copper evaporation heat transfer nanoparticles nucleation sorption surface roughness suspensions thermal conductivity two-phase flow water metallic nanofluids pool boiling nucleation site...
Journal Articles
Article Type: Photo Gallery
J. Heat Transfer. August 2011, 133(8): 080905.
Published Online: April 27, 2011
...Jae Bong Lee; Seong Hyuk Lee; Chang Kyoung Choi 27 04 2011 27 04 2011 aluminium contact angle drops flow visualisation high-speed optical techniques hole density hydrophobicity impact (mechanical) microfluidics milling machines surface energy surface roughness surface...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. May 2010, 132(5): 051301.
Published Online: March 8, 2010
...A. F. Emery; H. Dillon; A. M. Mescher The nominally one-dimensional conduction of heat through a slab becomes two dimensional when one of the surfaces is rough or when the boundary conditions are spatially nonuniform. This paper develops the stochastic equations for a slab whose surface roughness...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. December 2009, 131(12): 121009.
Published Online: October 15, 2009
...Benjamin J. Jones; John P. McHale; Suresh V. Garimella The effect of surface roughness on pool boiling heat transfer is experimentally explored over a wide range of roughness values in water and Fluorinert ™ FC-77, two fluids with different thermal properties and wetting characteristics. The test...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. August 2009, 131(8): 081902.
Published Online: June 5, 2009
... are acquired. The above data are obtained using commercial seamless stainless steel tube heater with an outer diameter of 9.0 mm and an average surface roughness of 1.09 μ m . The experimental results concluded that (i) critical heat flux (CHF) obtained in water with surfactant nanofluids gives nearly one...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. July 2009, 131(7): 071401.
Published Online: May 5, 2009
... on the surface roughness level and yields lower surface superheat in the cooling-down mode, compared with the heating-up mode, at a given heat flux. Microstructured surface with protrusions was further tested using two approaches to gain better understanding on hysteresis. Data indicated that microstructured...
Journal Articles
Article Type: Micro/Nanoscale Heat Transfer—Part I
J. Heat Transfer. March 2009, 131(3): 033107.
Published Online: January 21, 2009
... smooth minichannels. Surface roughness effects on the liquid-vapor flow are discussed. In this respect, the friction factor in the proposed model is modified, in order to take into consideration also effects due to wall roughness. Assuming that the gas core and the entrained liquid flow with the same...
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. March 2008, 130(3): 031701.
Published Online: March 6, 2008
... predictions of the peak values of the Reynolds shear stress and Reynolds heat flux and their locations in the intermediate layer are well supported by the experimental and direct numerical simulation (DNS) data. The inflectional surface roughness data in a turbulent channel flow provide strong support to our...
Journal Articles
Article Type: Technical Papers
J. Heat Transfer. January 2007, 129(1): 71–78.
Published Online: May 17, 2006
.... 09 01 2006 17 05 2006 surface texture surface roughness incoherent light annealing rapid thermal annealing silicon elemental semiconductors doping profiles light reflection rough surfaces Gaussian distribution finite difference time-domain analysis reflectivity...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. May 2005, 127(5): 472–485.
Published Online: May 25, 2005
... of the Reynolds analogy factor (i.e., 2 St / c f ) with Reynolds number, freestream pressure gradient, surface roughness, and freestream turbulence. While the factor is fairly independent of Reynolds number, it increases with positive (adverse) pressure gradient and decreases with negative (favorable) pressure...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. April 2005, 127(4): 393–403.
Published Online: March 30, 2005
...Ting Wang; Matthew C. Rice The surface roughness over a serviced turbine airfoil is usually multiscaled with varying features that are difficult to be universally characterized. However, it was previously discovered in low free-stream turbulence conditions that the height of larger roughness...