... coefficients at different working conditions Fig. 4 Cloud diagram of vapor–liquid two-phase distribution inside microtubes under different working conditions: ( a ) G = 100 kg/m 2 /s, q = 13 kW/m 2 , T stat = 280, 282, 284 K, x = 0.3, ( b ) G = 100, 180, 250 kg/m 2 /s, q = 13 kW/m 2 , T...

... The computational fluid domain contains micro helical tubes and shells. In Fig. 1 , all the used micro helical coils for the present study are demonstrated. The length and diameter of the shell are 216 mm and 40 mm respectively, while the length of the helical microtube is 200 mm. The copper is selected...