Table 4: The effect of the feed flow rate on the heat transfer coefficient, surface temperature, and temperature polarization coefficient at 55 and 65°C and a constant vacuum level of 92 kPa.

Feed flow rate () (mL/s)Re55°C65°C
(W/m2 K) (°C)TPC (W/m2 K) (°C)TPC

7.7783151420.151.70.941475.660.70.93
16.61657842587.552.30.952688.661.30.94
272746123874.552.70.964026.061.60.95
30.33112264282.553.20.974450.062.00.96