Study on the Instability of Two-Phase Flow in the Heat-Absorbing Tube of Trough Solar Collector

Figure 6

Streamlines in different Ra numbers.

(a) Ra = 0, t = 0.09

(b) Ra = 1.25E4, t = 0.09

(c) Ra = 6.25E4, t = 0.09

(d) Ra = 0, t = 1.99

(e) Ra = 1.25E4, t = 1.99

(f) Ra = 6.25E4, t = 1.99

(g) Ra = 0, t = 4.44

(h) Ra = 1.25E4, t = 4.44

(i) Ra = 6.25E4, t = 4.44