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

Figure 15

Variation of frictional pressure drop for vapor fraction of R1234yf at various temperatures of (a) 300 K, (b) 350 K, and (c) 400 K.

(a)

(b)

(c)