Experimental studies were conducted in a spiral plate heat exchanger with hot water as the service fluid and the two-phase system of water -palm oil in different mass fractions and flow rates as the cold process fluid. The two phase heat transfer coefficients were correlated with Reynolds numbers (Re) in the form h = a Re m , adopting an approach available in literature for two phase fluid flow. The heat transfer coefficients were also related to the mass fraction of palm oil for identical

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... lds numbers. The two-phase multiplier (ratio of the heat transfer coefficient of the two phase fluid and that of the single phase fluid) was correlated with the Lockhart Martinelli parameter in a polynomial form. This enables prediction of the twophase coefficients using single-phase data. The predicted coefficients showed a spread of ± 10 % in the laminar range.