Convection heat transfer from the surface of a non-isothermal rotating cone

• Main Authors: Hung-Sheng Wu, 吳鴻昇
• Other Authors: Yuan-Tang Lin
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/68215262844246332311

碩士 === 逢甲大學 === 機械工程學系 === 89 === Heat transfer of laminar mixed convection from a non-isothermal rotating cone is studied numerically. Results show that the Prandtl number and the surface temperature differences between the surface and the ambient air, i.e., , are vital to the velocity and the temperature field, it also reveals that the momentum transfer rate is comparable to the heat transfer rate at Pr=0.7, and heat transfer rate becomes greater than momentum transfer rate as increasing of the Prandtl number. Results also indicate that the Nusselt number decrease with increasing of ξ in the free convection dominate region (ξ< 0.4), it implies heat transfer rate suppressed by the cone rotation. While the Nusselt number increase with increasing of ξ and Pr in the region where forced convection dominated (ξ> 0.6), it means the forced convective heat transfer enhanced by the faster rotative motion and the higher Pr. Especially for the rotating cone with Pr=10 and m=-2, the colder air flows downward to repel the hotter air from the cone surface which tend to assist the heat transfer, as a result, the forced convection enhanced significantly under this condition.