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Investigation on flow and heat transfer characteristics in rectangular channel with drop-shaped pin fins

Propulsion and Power Research 2012年第1期1卷 64-70页

作者： Fengming Wang Jingzhou Zhang Suofang Wang Research Institute on General Development and Evaluation of Equipment EAAF of PLABeijing 100076China College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The flow and heat transfer characteristics inside a rectangular channel embedded with pin fins were numerically and experimentally *** differently shaped pin fins(i.e.,circular,elliptical,and drop-shaped)with the same cross-sectional areas were compared in a staggered *** Reynolds number based on the obstructed section hydraulic diameter(defined as the ratio of the total wetted surface area to the open duct volume available for flow)was varied from 4800 to *** more streamlined drop-shaped pin fins were better at delaying or suppressing separation of the flow passing through them,which decreased the aerodynamic penalty compared to circular pin *** heat transfer enhancement of the drop-shaped pin fins was less than that of the circular pin *** terms of specific performance parameters,drop-shaped pin fins are a promising alternative configuration to circular pin fins.

关键词： Enhanced heat transfer pin fins Drop-shaped pin fins Pressure loss Specific friction loss

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Time-accurate CFD conjugate analysis of transient measurements of the heat-transfer coefficient in a channel with pin fins

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Propulsion and Power Research 2013年第1期2卷 10-19页

作者： Tom I-P.Shih Saiprashanth Gomatam Ramachandran Minking K.Chyu School of Aeronautics and Astronautics Purdue UniversityWest LafayetteIN 47907USA Department of Mechanical Engineering and Material Science University of PittsburghPA 15261USA

Heat-transfer coefficients(HTC)on surfaces exposed to convection environments are often measured by transient techniques such as thermochromic liquid crystal(TLC)or infrared *** these techniques,the surface temperature is measured as a function of time,and that measurement is used with the exact solution for unsteady,zero-dimensional(0-D)or one-dimensional(1-D)heat conduction into a solid to calculate the local *** using the 0-D or 1-D exact solutions,the transient techniques assume the HTC and the free-stream or bulk temperature characterizing the convection environment to be constants in addition to assuming the conduction into the solid to be 0-D or *** this study,computational fluid dynamics(CFD)conjugate analyses were performed to examine the errors that might be invoked by these assumptions for a problem,where the free-stream/bulk temperature and the heat-transfer coefficient vary appreciably along the surface and where conduction into the solid may not be 0-D or *** problem selected to assess these errors is flow and heat transfer in a channel lined with a staggered array of pin *** conjugate study uses three-dimensional(3-D)unsteady Reynolds-averaged Navier-Stokes(RANS)closed by the shear-stress transport(SST)turbulence model for the gas phase(wall functions not used)and the Fourier law for the solid *** errors in the transient techniques are assessed by comparing the HTC predicted by the time-accurate conjugate CFD with those predicted by the 0-D and 1-D exact solutions,where the surface temperatures needed by the exact solutions are taken from the time-accurate conjugate CFD *** obtained show that the use of the 1-D exact solution for the semi-infinite wall to give reasonably accurate“transient”HTC(less than 5%〇relative error).Transient techniques that use the 0-D exact solution for the pin fins were found to produce large errors(up to 160%relative error)because the HTC varies appreciably about each pin fin.

关键词： Heat-transfer coefficient(HTC) Transient technique pin fins Time-accurate computational fluid dynamics(CFD)conjugate analysis

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