基本流體力學分離(迴)流及傳熱機制之學理研究

這包括強制(靜止/與旋轉系統)與自然對流用實驗/及數值計算來對分離/迴流特性及傳熱機制,特別是旋轉效應做更進一步了解。實瞨方法包括以光學定性(流場)及定量(LDV)量測流場兩種方法,利用數值及實驗方法來探討層/紊流經粗糙阻堆時之流動現象。並對阻塊的展弦比,雷諾數及起始邊介層厚度等變數來研究對流流易、 分離區、再附著區場的影響。發表十篇期刊論文(請見代表著作兩篇)。而曾被ASME相關研討會邀請為專題討論專家(panel discussor)兩次參與研討會討論。

Laminar fored convection from Surface-mounted ribs

Author
Source
Abstract
SHOU-SHING HSIEH, HUEI-JAN SHIH and YING-JONG HONG
International Journal of Heat and Mass Transfer, Vol.33,No.9,pp.1987-2000,1990
A study for both numerical and experimental aspects on low speed forced convective heat transfer near two-dimensional transverse ribs in which the walls are held at a uniform temperature is presented. The effects of aspect ration and Reynolds number as well as the initial boundary layer thickness are examined and discussed. The numerical technique is based on a power law combined with a false stream function- vorticity form. It is found that the temperature data agree reasonable well with those taken from the experiments qualitatively. The results are further correlated by an equation of the form.

Numerical Computation of Laminar Separation and Reattachment of Flow Over Surface Mounted Ribs

Author
Source
Abstract
YING-JONG HONG , SHOU-SHING HSIEH , HUEI-JAN SHIH
ASME Journal of Fluids Engineering, Vol.113,No.2,1991,pp.190-198
Numerical results are presented concerning the fluid characteristics of steady-state laminar flow over surface mounted ribs. Computations are carried out using a false transient stream function- vorticity form. The effects of the aspect ratios (width-to-depth) of the ribs and Reynolds numbers as well as initial boundary-layer thickness on entire flow field, separated region, and reattachment length are presented and discussed. The computed reattachment distance compares reasonably well with those data reported by previous studies. A correlation is provided in terms of the rib aspect ration, Reynolds number , and the ratio of boundary-layer thickness and rib height. The pressure drop is excessive along the upstream vertical step face and it recovers thereafter, which agrees qualitatively with those of the previous studies for the flow over backward-facing steps.