| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 91 === The detailed numerical study is carried out to investigate conjugate heat transfer in horizontal channels with a heated section. The turbulent-governing equations are solved by a Control-Volume base on finite-difference method with power-law scheme, and the well-known turbulence model and its associate wall function to describe the turbulent structure. The SIMPLE algorithm is adopted to solve the pressure-velocity coupling.
The parameters studied include laminar and turbulent Reynolds number (Re=9.5~500, Re=3000~10000), temperature of heated section
( =800K, 900K, and 1000K) or constant heat flux ( =12.7 , 38.1 , 63.5 ), length of heated section ( =0.1651m, 0.2032m, 0.3048m).
In the numerical study, the gas flow field temperature distribution and heat transfer are examined with the experimental results of Chiu et al. (2001) and show good agreement. Conjugate heat transfer is demonstrated to significantly affect the temperature distribution and uniformity at the heated section’s surface, channel wall and the gas phase, thus impacting the rate of heat transfer. Numerical prediction obtained from this study will provide physical insight into conjugate heat transfer effects and facilitates validation of numerical conjugate heat transfer models.
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