Characterization of flow field in a ventilated space and simulation of heat exchange between cows and their environment
Gebremedhin, K. G. and Wub, B. X.
2003 Journal of Thermal Biology, 28(4): 301-319
Gebremedhin, K. G. and Wub, B. X., (2003), "Characterization of flow field in a ventilated space and simulation of heat exchange between cows and their environment", Journal of Thermal Biology, 28(4): 301-319.
Abstract:
Several turbulence models are available in the literature, and each model has its own unique features. To establish the most appropriate model for characterizing the flow field in a multiple-occupancy ventilated space; five different turbulence models are evaluated. The turbulence models studied are: (1) the standard 百?var epsilon model, (2) the RNG 百?var epsilon model, (3) the Low-Reynolds-Number 百?var epsilon model, (4) the 百-肋 model, and (5) the Reynolds Stress Model (RSM). Based on convergence and computational stability criteria, the RNG 百?var epsilon model was found to be the most appropriate model that characterizes the flow field in a ventilated space occupied by ten cows positioned at random. The micro-flow field associated with each cow was used to simulate heat exchange between the animal and its environment. A coupled heat and mass transfer model was developed to simulate the heat exchange. The total heat loss from the cows varied approximately between 215 and 710 W because of variations in flow fields surrounding the animals.
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