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

Figure 11

Flow formation for R32-Al₂O₃ nanofluid and quality within 0.01∼0.83 occurred before the bend (x = 0.01 to 0.41), at the bend (x = 0.51 to 0.64), and after the bend (x = 0.75 to 0.83) at the mass flux of 160 kg/m²·s and at the temperature of 350 K.