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Keyword: turbulence
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Journal Articles
Article Type: Research-Article
J. Heat Transfer. February 2016, 138(2): 022901.
Paper No: HT-15-1020
Published Online: September 2, 2015
... Ravigururajan and Bergles correlation, by adopting the Churchill model to calculate the smooth-tube friction factor and by using the hydraulic diameter in the Reynolds number, can predict single-phase turbulent frictional pressure drop data relatively well. Eleven pressure drop correlations were evaluated by...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. November 2014, 136(11): 112203.
Paper No: HT-13-1238
Published Online: September 16, 2014
.... Klinzing. 07 05 2013 02 08 2014 The turbulent heat transfer by a confined jet flowing inside a hot cylindrical cavity is investigated numerically in this paper. This configuration is found in several engineering applications such as air conditioning and the ventilation of mines...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. February 2014, 136(2): 022501.
Paper No: HT-13-1035
Published Online: November 7, 2013
...; published online November 7, 2013. Assoc. Editor: James A. Liburdy. 22 01 2013 10 07 2013 The effect of the uniform fluid properties approximation (Oberbeck-Boussinesq (OB)) in turbulent mixed convection is investigated via direct numerical simulation (DNS) of water flows with viscosity...
Journal Articles
Article Type: Research-Article
J. Heat Transfer. August 2013, 135(8): 081901.
Paper No: HT-12-1343
Published Online: June 27, 2013
... from 1 mm to 2.5 mm) are numerically predicted using commercial computational fluid dynamics (CFD) code, Ansys cfx . The turbulent model employed is the k–ω based shear–stress transport (SST) model with automatic wall function treatment. In the performance evaluation, we use a “universal” porous media...
Journal Articles
Article Type: Heat And Mass Transfer
J. Heat Transfer. August 2012, 134(8): 082001.
Published Online: May 29, 2012
... selected as the calculation domain. The liquid flow inside the fibers is assumed to be laminar due to the low Reynolds numbers, while the air flow across the bank is considered to be turbulent as a result from the disturbances from the numerous fibers. The governing equations for fluid flow and heat and...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. April 2012, 134(4): 041701.
Published Online: January 26, 2012
...Koji Matsubara; Atsushi Sakurai; Takahiro Miura; Takuya Kawabata The near-wall turbulent heat transport of the three orthogonal directions was directly solved for the Prandtl numbers ranging from 0.025 to 5.0 to validate the algebraic models of the turbulent heat flux. Two kinds of thermal...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. March 2012, 134(3): 031016.
Published Online: January 18, 2012
...Jayathi Y. Murthy; Sanjay R. Mathur During the few decades, computational techniques for simulating heat transfer in complex industrial systems have reached maturity. Combined with increasingly sophisticated modeling of turbulence, chemistry, radiation, phase change, and other physics, powerful...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. March 2012, 134(3): 031009.
Published Online: January 13, 2012
...Nobuhide Kasagi; Yosuke Hasegawa; Koji Fukagata; Kaoru Iwamoto Because of the importance of fundamental knowledge on turbulent heat transfer for further decreasing entropy production and improving efficiency in various thermofluid systems, we revisit a classical issue whether enhancing heat...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. March 2012, 134(3): 031004.
Published Online: January 11, 2012
... is the thermal mixing in the water pool, and the other is the thermo-hydraulically induced mechanical loads acting on the structures of relevant systems. The two concerns are inter-related and can be well described only if the local behavior of the condensing steam jets and the resultant turbulent...
Journal Articles
Article Type: Foreword
J. Heat Transfer. March 2012, 134(3): 030501.
Published Online: January 10, 2012
...Yogesh Jaluria; Jungho Kim; Avram Bar-Cohen; Michael Jensen 10 08 2011 11 08 2011 08 09 2011 10 01 2012 10 01 2012 flow through porous media food processing industry heat transfer inverse problems microchannel flow turbulence This special volume entitled...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. March 2012, 134(3): 031001.
Published Online: January 9, 2012
...Pedro J. Coelho Theoretical analysis and experimental investigations have shown that the mean heat fluxes in turbulent gaseous flows are influenced not only by the mean scalar fields (temperature and molar fraction of the species) but also by the scalar fluctuations. It is widely recognized that...
Journal Articles
Article Type: Heat Transfer In Nanochannels, Microchannels, And Minichannels
J. Heat Transfer. February 2012, 134(2): 020904.
Published Online: December 13, 2011
... velocity components. This enables a detailed comparison of URANS and LES to assess the URANS modeling assumptions as well as a flow decomposition with respect to the flow structure’s influence on surface heat transfer. This analysis shows low order modes which do not contribute to turbulent heat flux, but...
Journal Articles
Article Type: Heat Transfer In Nanochannels, Microchannels, And Minichannels
J. Heat Transfer. February 2012, 134(2): 020903.
Published Online: December 13, 2011
... mass flow rate of 19.5 mg/s compared to measured values of 63 K and 19.4 mg/s, therefore, showing that conventional macroscale correlations can hold well for turbulent microscale flow and heat transfer as long as the validity of the assumptions is verified. Joule–Thomson microcooler microchannel...
Journal Articles
Article Type: Technical Briefs
J. Heat Transfer. January 2012, 134(1): 014503.
Published Online: November 18, 2011
...Zhipeng Duan Fully developed turbulent flow in noncircular ducts is examined, and simple models are proposed to predict the friction, heat and mass transfer in most common noncircular channels. It is found that the square root of cross-sectional area is the relatively more appropriate length scale...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. January 2012, 134(1): 011901.
Published Online: October 27, 2011
... ) ] The uncertainty of the friction factor is within ±4.4% at a 95% confidence level. 30 08 2010 12 08 2011 27 10 2011 27 10 2011 channel flow gas turbines heat transfer mass transfer rotational flow swirling flow turbulence gas turbine internal passage cooling...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. December 2011, 133(12): 122505.
Published Online: October 12, 2011
... loop model is set up and the effect of pipe diameter is systematically analyzed. Finite volume method is used to solve the conservative equations with supercritical turbulence model incorporated. It is found that supercritical CO 2 thermosyphon can achieve high Reynolds flow as 104–105 even temperature...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. December 2011, 133(12): 122203.
Published Online: October 7, 2011
... internal semicircular channel to promote the heat transfer at different jet Reynolds numbers ( Re jet = 1000–5000). Three turbulence models, namely, the standard k – ɛ, k – ω and the Reynolds stress model (RSM) have been investigated in the present paper by comparing Nusselt number and normalized pressure...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. December 2011, 133(12): 121801.
Published Online: October 6, 2011
... confined flow external flows flow simulation heat exchangers laminar flow mechanical engineering computing numerical analysis pipe flow turbulence volume averaging theory closure field synergy principle fin-and-tube heat exchanger representative elementary volume Volume averaging...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. November 2011, 133(11): 111701.
Published Online: September 16, 2011
...Zhongxuan Du; Wensheng Lin; Anzhong Gu Cooling of supercritical CH 4 /N 2 mixture is the most important heat transfer process during coalbed methane (CBM) liquefaction. In this paper, numerical studies of the turbulent convective heat transfer of supercritical CH 4 /N 2 flowing inside a vertical...
Journal Articles
Article Type: Research Papers
J. Heat Transfer. November 2011, 133(11): 111901.
Published Online: September 16, 2011
... (friction and heat transfer roughness functions, respectively) as a function of the roughness Reynolds number ( e + ). channel flow engines gas turbines heat transfer pipe flow plates (structures) turbulence rib turbulators internal cooling gas turbine cooling heat transfer enhancement...