Second Law Analysis of Laminar Flow in a Circular Pipe Immersed in an Isothermal Fluid | Zendy

Vishal Anand | Zendy; Krishelanti | Zendy

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Second Law Analysis of Laminar Flow in a Circular Pipe Immersed in an Isothermal Fluid

Author(s) -

Vishal Anand,

Krishelanti

Publication year - 2013

Publication title -

journal of thermodynamics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.112

H-Index - 11

eISSN - 1687-9252

pISSN - 1687-9244

DOI - 10.1155/2013/234264

Subject(s) - laminar flow , bejan number , reynolds number , thermodynamics , mechanics , dimensionless quantity , power law fluid , biot number , isothermal process , brinkman number , materials science , heat transfer , fluid dynamics , plug flow , physics , non newtonian fluid , nusselt number , turbulence

Entropy generation and pumping power to heat transfer ratio (PPR) of a laminar flow, for a circular tube immersed in an isothermal fluid, are studied analytically in this paper. Two different fluids, namely, water and ethylene glycol, are chosen to study the influence of fluid properties on entropy generation and PPR. The expressions for dimensionless entropy generation, Bejan number and PPR are derived in a detailed way and their variations with Reynolds number, external Biot number, and the dimensionless temperature difference are illustrated. The results of the analysis are compared with those for a laminar flow in a circular tube with uniform wall temperature boundary condition. Finally, a criterion is established to determine which type of thermal boundary conditions is more suitable for a particular fluid, with respect to its influence on entropy generation

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