上下に細長い開口部を有する水平環状すきま内に置かれた円管の沸騰熱伝達
1993 年 59 巻 568 号 p. 3899-3905
詳細
1993 年 59 巻 568 号 p. 3899-3905
An experimental investigation of boiling heat transfer of saturated R11 has been conducted with a horizontal cylinder which is 20 mm in diameter and 50 mm in length, and is enclosed by concentric outer tubes. These outer tubes have two holes which are 3 mm in width and 60 mm long. The clearance (c) between these tubes ranged from 0.15 mm to ∞ and heat flux (q) from 600 to 1.5×105 W/m2. Heat transfer characteristics are demonstrated and discussed in this report. The main results obtained are summarized as follows: (1) The heat transfer coefficient a increases with decreasing c in the ranges of c=0.35 mm to 0.75 mm and q=0.4×104 to 5×104 W/m2. (2) The critical heat flux qc decreases with decreasing c when c≤0.75 mm.
