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

Figure 20

Flow formation for R1234yf-Al₂O₃ nanofluid and vapor quality within 0.01∼0.91 occurred before the bend (x = 0.01 to 0.48), at the bend (x = 0.58 to 0.71), and after the bend (x = 0.83 to 0.91) at the mass flux of 160 kg/m²·s and temperature of 350 K.