An experimental work is carried out for air-water system in 1-2 shell and tube heat exchanger with variable configuration for the
passage of heating and test fluids with parallel and countercurrent flow. Two-phase parameters such as quality, Lockhart- Martinelli (L-M) parameter and two-phase multiplier were determined. Results showed that the heat transfer coefficient increases with quality for two-phase flow for the range of Reynolds number and quality studied. The L-M parameter is inversely proportional to quality. The two-phase multiplier shows a decreasing trend with increase in L-M parameter as reported in literature, Salcuden et al. [1] From the correlation h₁ = a N_Re^m , the heat transfer coefficient for two-phase flow can be predicted using the Lockhart-Martinelli parameter - Quality correlation with an error of less than 12%.

Keywords: Heat transfer, Two-Phase multiplier, Tube heat exchanger