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Keywords: surface roughness
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Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research-Article
J. Heat Mass Transfer. September 2015, 137(9): 091007.
Paper No: HT-14-1075
Published Online: September 1, 2015
.... These samples exhibit different surface characteristics such as average thickness of the layer of CNFs and a-C, surface roughness intensity, surface area, and area coverage of the layer of CNFs. In this section, surface characterization and evaluation for the three different samples synthesized at 16 min, 23...
Journal Articles
Publisher: ASME
Article Type: Research-Article
J. Heat Mass Transfer. September 2015, 137(9): 091006.
Paper No: HT-14-1073
Published Online: September 1, 2015
... were tested. Table 2 shows the results for surface roughness, density of the diamond particles, and contact angle with the dielectric liquid (Asahi Glass Co., Ltd., AE-3000). The surface roughness was measured using a high accuracy laser displacement sensor (Keyence, LT-9010M), and the contact angle...
Journal Articles
Publisher: ASME
Article Type: Research-Article
J. Heat Mass Transfer. March 2014, 136(3): 031501.
Paper No: HT-12-1370
Published Online: November 21, 2013
... heat flux, ultrasonic frequency, and pressure amplitude. The present results clearly bring out an interactive effect of these operating parameters with surface parameter like surface roughness. A mechanistic model unifying all these parameters has been presented to explain quantitatively the physics...
Journal Articles
Publisher: ASME
Article Type: Research-Article
J. Heat Mass Transfer. August 2013, 135(8): 081901.
Paper No: HT-12-1343
Published Online: June 27, 2013
... mixing. With the flow marching in a more intense spiral pattern, a 40% improvement of heat transfer enhancement over the circular scale-roughened channels is observed. rectangular channel elliptic scale surface roughness heat transfer enhancement volume averaging theory VAT CFD turbulence...
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Heat Transfer In Nanochannels, Microchannels, And Minichannels
J. Heat Mass 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
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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. 12 09 2009 28 08 2010 31 08 2011 31 08 2011 boiling copper evaporation heat transfer nanoparticles nucleation sorption surface roughness suspensions thermal conductivity two-phase...
Journal Articles
Publisher: ASME
Article Type: Photo Gallery
J. Heat Mass Transfer. August 2011, 133(8): 080905.
Published Online: April 27, 2011
...Jae Bong Lee; Seong Hyuk Lee; Chang Kyoung Choi aluminium contact angle drops flow visualisation high-speed optical techniques hole density hydrophobicity impact (mechanical) microfluidics milling machines surface energy surface roughness surface texture water wetting 27...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Micro/Nanoscale Heat Transfer—Part I
J. Heat Mass 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. 14 04 2008 29 08 2008 21 01 2009 channel flow...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Technical Papers
J. Heat Mass Transfer. January 2007, 129(1): 71–78.
Published Online: May 17, 2006
.... Generally speaking, the longer the physical path length traveled by the wave, the more time steps are needed to ensure there is sufficient time for all the scattered waves to interact and reach steady state results. Therefore, longer path length and larger surface roughness require a much larger number...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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...