In a dairy operation, milk at a flow rate of 250 L/h and a cow-body temperature of 38.6 °C must be chilled to a safe-to-store temperature of 13 °C or less. Ground water at 10 °C is available at a flow rate of 0.72 m³/h. The density and specific heat of milk are 1030 kg/m³ and 3860 J/kg-K, respectively. ,By using NTU method, determine the UA product of a counterflow heat exchanger (a) required for the chilling process. Determine the length of the exchanger if the inner pipe has a 50-mm diameter and the overall heat transfer coefficient is U = 1000 W/m²-K. (b) · Determine the outlet temperature of the water.

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Convective Mass Transfer between Phases

Mass transfer means the transport or movement of mass using streams, phases, components, and so on from one location to another.