The heat transfer performance of air distribution from a domain with uniform air intake is significantly better compared to that of an air inlet with an expansion angle in a circular area. The difference between the forked row and the regular row is more pronounced. However, as the inlet expansion angle increases, the fluid distribution becomes more uniform, and the variation in heat transfer performance gradually diminishes.
When comparing resistance performance, horizontally aligned tube bundles with uniform distribution show different characteristics compared to those with round shell configurations. In both cases, the number of tubes per row is the same, and the flow velocity at the narrowest cross-section of each row is also equal. For a circular-shaped tube bundle, the flow resistance is influenced by these factors. However, due to the unequal number of tubes in horizontal and vertical rows, the flow velocity at the minimum cross-section varies, and the inlet expansion angle further complicates the situation.
The impact of these factors on resistance is more complex, especially when considering the flow velocity and the number of tube rows. It's challenging to find a consistent reference scale for flow velocity. Additionally, the number of tubes in each row along the flow direction is not uniform, so the effect of each row on flow resistance differs. Even with a large number of tube rows, the pressure drop through each row is clearly related to the number of tubes present in that row.
To compare the resistance performance of square and circular areas with different inlet expansion angles, the number of heat exchange tubes in both configurations is kept the same. The diameter, spacing, and length of the tubes are also identical. Under these conditions, the influence of the inlet expansion angle on the resistance of tubes in the square and circular areas is analyzed, using inlet mass flow rate as a variable. This comparison provides a clearer understanding of how geometry and flow dynamics affect overall system performance.
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