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 ¦Ę?var epsilon model, (2) the RNG ¦Ę?var epsilon model, (3) the Low-Reynolds-Number ¦Ę?var epsilon model, (4) the ¦Ę-¦Ř model, and (5) the Reynolds Stress Model (RSM). Based on convergence and computational stability criteria, the RNG ¦Ę?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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