combined effects of pipe diameter, reynolds number and wall heat flux and on flow, heat transfer and second-law characteristics of laminar-transitional micro-pipe flows管的直径、雷诺数和墙热通量和流动,传热和第二定律的特点laminar-transitional微管道流动.pdfVIP

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combined effects of pipe diameter, reynolds number and wall heat flux and on flow, heat transfer and second-law characteristics of laminar-transitional micro-pipe flows管的直径、雷诺数和墙热通量和流动,传热和第二定律的特点laminar-transitional微管道流动.pdf

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combined effects of pipe diameter, reynolds number and wall heat flux and on flow, heat transfer and second-law characteristics of laminar-transitional micro-pipe flows管的直径、雷诺数和墙热通量和流动,传热和第二定律的特点laminar-transitional微管道流动

Entropy 2010, 12, 445-472; doi:10.3390/ OPEN ACCESS entropy ISSN 1099-4300 /journal/entropy Article Combined Effects of Pipe Diameter, Reynolds Number and Wall Heat Flux and on Flow, Heat Transfer and Second-Law Characteristics of Laminar-Transitional Micro-Pipe Flows A. Alper Ozalp Department of Mechanical Engineering, University of Uludag, 16059 Gorukle, Bursa, Turkey; E-Mail: aozalp@.tr Received: 3 December 2009; in revised form: 16 February 2010 / Accepted: 21 February 2010 / Published: 9 March 2010 Abstract: Fluid flow, heat transfer and entropy generation characteristics of micro-pipes are investigated computationally by considering the simultaneous effects of pipe diameter, wall heat flux and Reynolds number in detail. Variable fluid property continuity, Navier-Stokes and energy equations are numerically handled for wide ranges of pipe 2 diameter (d = 0.50–1.00 mm), wall heat flux ( q = 1000–2000 W/m ) and Reynolds number (Re = 1 – 2000), where the relative roughness is kept constant at ε/d = 0.001 in the complete set of the scenarios considered. Computations indicated slight shifts in velocity profiles from the laminar character at Re = 500 with the corresponding shape factor (H) and intermittency values (γ) of H = 3.293→3.275 and γ = 0.041→0.051 (d = 1.00→0.50 mm). Moreover, the onset of transition was determined to move d