Experimental investigation on heat transfer in horizontal-tube falling-film evaporator

Abstract

A B S T R A C TAn experimental platform for horizontal-tube falling-film evaporation was set up to measure heat transfer characteristics. Experiments were carried out to show how the heat transfer coefficient (HTC) was affected by different parameters including spray Reynolds number (Re), saturation temperature, salinity, and tube arrangement. The results revealed that the HTC increased first and then decreased with growth of Re, and the HTC of seawater decreased with increasing saturation temperature. The results also showed that the HTC of rotated square pitch was higher than triangular pitch, rotated triangular pitch, and square pitch, but the heat transfer capacity per unit volume of triangular pitch was the highest. Meanwhile, the HTC decreased during the increase of salinity.

Experimental Study of Heat Transfer and Hydrodynamics of Falling Film on a Novel Design of Helical Finned Tube Evaporators

“…The simulation was conducted with the superficial evaporation temperature on the shell side of 60°C, the superficial overall temperature difference of 3.0°C, the inlet brine salinity of 30 g/kg, the inlet brine spray density of 0.06 kg/m s, and the maximum steam inlet velocity of 40 m/s. S. Shen et al [2] performed an experimental platform for horizontal-tube falling-film evaporation to measure heat transfer capacity HTC. The results revealed that the HTC increased first and then decreased with growth of Reynolds number Re, and the HTC of seawater decreased with increasing saturation temperature.…”