Number：

02100003

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Name：

曾憲中

Titles：

Professor

Author：

Sheng-Chung Tzeng,Tzer-Ming Jeng,Yen-Yi Chung

Paper name：

Heat transfer characteristics of a rotating Al-foam cylinder under the confined/unconfined impinging jet

Name of activity：

The 35th National Conference on Theoretical and Applied Mechanics

Keywords：Heat transfer,Oncoming air flow,Pin-fin heat sink,Copper foams.

Abstract：This study experimentally investigated the fluid flow and heat transfer characteristics of the pin-fin heat sink partially filled with copper foams under the oncoming air flow. The copper foams would be filled into the longitudinal interval spaces of the pin-fin heat sink. The dimensions of the pin-fin heat sink including a 5 mm –thickness spreader were fixed: 120 mm in length, 60 mm in width and 32 mm in height. The porosity f copper foams was 0.97 Relevant variabies were the side length of the pin-fin (s=5 and 6.3 mm), the space between pin fins

(g_L= 6.33-18.0 mm and g_r= 7.13-22.5 mm), the pore density of the copper foams (PPI = 20 and 50) and the Reynolds number ( = 3208-50069). The experimental results indicated that , at the same , the Model A1C1

( s = 6.3 mm, g_L = 6.33 mm, g_r = 7.12 mm and PPI=50) and Model A1C2

( s = 6.3 mm, g_L = 6.33 mm, g_r = 7.12 mm and PPI=20) had the maximum average Nusselt number (N_u). Besides, at the same pumping power, the Model A1 had better performances. However, the heat transfer performances of the Model A1C2 would be better than that of the Model A1 when the dimensionless pumping power exceeded . It demonstrated that the pin-fin heat sink filled with copper foams had the high heat-transfer potential for the system operated at the high pumping power.

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