Effects of Heat Transfer Characteristics of R32 and R1234yf with Al₂O₃ Nanoparticle through U-Bend Tube Evaporator

Figure 6

Variation of frictional pressure drop for vapor fraction of R32 at various mass fluxes and at temperatures of (a) 300 K, (b) 350 K, and (c) 400 K.

(a)

(b)

(c)