MASS TRANSFER OF MOISTURE AND AMMONIA FROM MANURE AND MANURE LITTER MIXTURE IN FREE-STALL HOUSING

摘要

Mass transfer coefficients of moisture at the surface of pure waste, and a mixture of waste and litter were obtained from wind tunnel tests quantify moisture movement from surface of free-stall barn with high moisture. The mass transfer coefficients were expressed as a function of air velocity. Mass transfer of coexistent convection was then examined. Mass transfer of moisture from the waste and litter mixture was found to be larger than that from pure waste. It was also found that mixing litter with waste contributed to the removal of moisture from the floor surface by airflow. The surface temperature of waste or waste litter considerably affected the rate of moisture removal. Mass transfer coefficients of ammonia and an equation for ammonia generation rates from floor surfaces were likewise obtained from dimensionless numbers and wind tunnel tests.