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Keywords: entropy
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Journal Articles
Journal Articles
Publisher: ASME
Article Type: Discussions
J. Heat Mass Transfer. April 2014, 136(4): 045501.
Paper No: HT-13-1403
Published Online: February 18, 2014
...? entransy entropy exergy The science of thermodynamics as part of the physics nowadays is well established, based on four principle laws (numbered 0–3), and widely accepted as one of the fundamental sciences. Historically, there was some confusion with respect to “heat” as a thermodynamic...
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass 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
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. March 2012, 134(3): 031003.
Published Online: January 10, 2012
...Heinz Herwig Entropy generation in a velocity and temperature field is shown to be very significant in momentum and heat transfer problems. After the determination of this postprocessing quantity, many details about the physics of a problem are available. This second law analysis (SLA) is a tool...
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Technical Briefs
J. Heat Mass Transfer. April 2011, 133(4): 044503.
Published Online: January 13, 2011
.... The effects of inlet conditions of the working fluids on the heat transfer characteristics were correlated via entropy generation number and exergy loss. The variation of the effectiveness with the number of transfer unit of heat recovery unit was calculated and discussed in terms of literature. 08 03...
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. December 2010, 132(12): 122401.
Published Online: September 17, 2010
...Jie Li; Clement Kleinstreuer Employing a validated computer simulation model, entropy generation is analyzed in trapezoidal microchannels for steady laminar flow of pure water and CuO-water nanofluids. Focusing on microchannel heat sink applications, local and volumetric entropy rates caused...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. December 2010, 132(12): 121401.
Published Online: September 17, 2010
...Meghdad Saffaripour; Richard Culham A new nonintrusive and whole field method for the measurement of entropy generation in microscale thermal-fluid devices is presented. The rate of entropy generation is a measure of the thermodynamic losses or irreversibilities associated with viscous effects...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. November 2010, 132(11): 111802.
Published Online: August 13, 2010
...Ahmad Fakheri This paper further explores the topic of an ideal heat exchanger, which is still an open question. It is shown that the minimization of entropy production or exergy destruction should not be an objective in heat exchanger design. It is further proven that heat exchanger effectiveness...
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. October 2010, 132(10): 101301.
Published Online: July 27, 2010
... of entropy are processes inherently associated with thermal energy transport, yet little has been done to analyze entropy generation in solids at length scales comparable with or smaller than the mean free path of heat carriers. This work extends the concept of radiation entropy in a participating medium...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. October 2010, 132(10): 101801.
Published Online: July 27, 2010
... of energy are evaluated by the entropy generation number and exergy losses, the CH-STHX decreased the entropy generation number and exergy losses by 30% and 68% on average than the SG-STHX for the same Reynolds number. The analysis from nondimensional correlations for Nusselt number and friction factor also...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. September 2010, 132(9): 091701.
Published Online: June 28, 2010
...Mohammad Shanbghazani; Vahid Heidarpoor; Marc A. Rosen; Iraj Mirzaee The entropy generation is investigated numerically in axisymmetric, steady-state, and incompressible laminar flow in a rotating single free disk. The finite-volume method is used for solving the momentum and energy equations...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. June 2010, 132(6): 061702.
Published Online: April 2, 2010
... . Two performance measures are used to compare the different pin fin densities. The first measure is to maximize heat transfer capacity for a given pumping power compared with a plane channel. The second measure used is based on entropy generation minimization (EGM), where the objective is to reduce...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. October 2009, 131(10): 101002.
Published Online: July 28, 2009
... medium system is considered. Key results from the application of this theory are used to develop a simplified entropy inequality, which is in turn used to guide the development of closure relations. The decomposition of exchange terms is considered, and closed models for internal energy are derived...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. August 2009, 131(8): 082301.
Published Online: June 5, 2009
... geometry exergetically achieves the highest efficiencies. The difference between the two results is mainly through the accounting of entropy generation and exergy destroyed, and the largest mode of thermal exergy loss is found to be through entropy generation resulting from heat transfer accompanying phase...
Journal Articles
Publisher: ASME
Article Type: Technical Briefs
J. Heat Mass Transfer. February 2009, 131(2): 024503.
Published Online: December 29, 2008
... and porosity. The thermal performance was evaluated by the ratio of the Nusselt number with and without a high porous material and the entropy generation. It was recognized that the high porous material was effective in low Reynolds numbers and the Reynolds number, which minimized the entropy generation...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Heat Mass Transfer. November 2007, 129(11): 1564–1575.
Published Online: February 24, 2007
..., and average entropy generation number are calculated and displayed in order to show their dependency on and variation with Rayleigh number (Ra), surface waviness ( λ ) , and aspect ratio ( A R ) of the enclosure. Depending on the wall waviness pattern, the enclosure is divided into three modes (phase-plus...