Developing heat transfer and pressure loss in an air passage with multi discrete V-blockages

The multi V blockage shapes in discrete type have been evaluated for augmentation in heat transfer and pressure loss in an air flow passage. The data points obtained during experimentation are correlated among different geometrical variations specified as: distance of blockage, width of the blockage, height of the blockage, pitch between the consecutive blockages, width of the discrete region of the blockage, and attack angle of the flow. These variations in the configuration of the multi discrete V-blockage has significant effect on heat transfer and pressure loss in an air flow passage. The aspect ratio of the air flow passage is 10. The flow Reynolds number is varied within the range: 3000-8000. The relative blockage height varied in the range: 0.25-1.0, relative blockage pitch in the range: 8.0-12, relative blockage distance in the range: 0.27-0.77, relative discrete width in the range: 0.50-1.5, flow attack angle in the range: 30-70° and relative blockage width in the range: 1.0-6.0. The investigation affirms the achievement of high thermohydraulic performance, the best achieved at relative blockage height of 0.5, relative blockage pitch of 10, discrete blockage distance of 0.67, relative discrete width of 1.0, flow attack angle of 60° and relative blockage width of 5.0 compared to an air passage without blockages. The investigation has been further carried out to develop Nusselt number and friction factor correlations in terms of flow and geometrical parameters. Further, the performance of different blockage shapes with that of present study has been carried out in terms of thermohydraulic performance parameter.