Conjugate heat and species transport in an air filled ventilated enclosure with a thermo-contaminated block

The flow visualization, thermal and solutal effects in a ventilated enclosure around a thermocontaminated square block is numerically modeled. Simulations are performed for different locations and different sizes of the thermo-contaminated block with inlet and outlet port along the vertical walls where coolant air is supplied and contaminated air is flush out. The block is maintained with higher temperature and species concentration compared to the injected cold fluid. The walls are assumed as impermeable and adiabatic to heat and solute. The heat and species transfer rate along the surface of the block is compared for different values of Richardson number, Reynolds number, buoyancy ratio and block positions. Cooling efficiency inside the enclosure and average fluid temperature is calculated for different physical flow parameters to find the most suitable size and position of the block in order to obtain the maximum heat and mass transfer rate inside the enclosure. It is found that maximum cooling inside the enclosure is obtained when thermo-contaminated block is placed near the outlet port. (C) 2017 Elsevier Ltd. All rights reserved.