Abstract
ABSTRACT THIS paper describes the heat transfer characteristics of beef cattle manure slurry in laminar tube flow in concentric-tube heat exchanger. The heat exchanger's effectiveness in heating the slurry decreased as the flow rate increased and may be the same or lower than that of heating water at the same mass flow rate. The observed film heat transfer coefficients of the slurry in laminar flow were found to range from 0.401 to 3.47 kJ/s m^C and Nusselt numbers ranged from 9.26 to 79.7 for Graetz numbers between 7.6 and 349. At low solids concentrations, the observed slurry Nusselt numbers were much higher than theoretical results of laminar heat transfer of Newtonian and Power-Law fluids. However, at high solids concentrations, the observed Nusselt numbers agreed better with the theoretical results.
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