Thermal mixing and stratification are explored experimentally in a horizontal cylindrical tank, which simulates a storage of water heated by a solar collector. The tank is 70 cm long and 24 cm in diameter. The study is conducted in a transient mode, namely, the tank is filled with hot water, which in the course of operation is replaced by the tap water in a stratified way or by mixing. The flow rates of 2 l/min, 3 l/min, 5 l/min, and 7 l/min are explored. Temperature of hot water is usually about , while the tap water is about . In the experiments, both flow visualization and temperature measurements are used. The effects of port location and deflector installation are examined. The experimental results are presented in a dimensionless form, as the normalized outlet temperature versus dimensionless time. Three-dimensional transient numerical simulations, done using the FLUENT 6 software, provide an additional insight in the process of mixing inside the tank.
Experimental and Numerical Study of Mixing in a Horizontal Hot-Water Storage Tank
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Aviv, A., Morad, S., Ratzon, Y., Ziskind, G., and Letan, R. (June 10, 2009). "Experimental and Numerical Study of Mixing in a Horizontal Hot-Water Storage Tank." ASME. J. Sol. Energy Eng. August 2009; 131(3): 031004. https://doi.org/10.1115/1.3142801
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