Abstract

The enhancement with porous media involvement is estimated and compared for three varieties of shell and tube heat exchangers (STHXs), with helical, segmental and clamping anti-vibration baffles, with two variations, viz., porosity value and dimension of this media (radius). In this study, further improvement in the thermo-hydraulic performance of the anti-vibration baffles design of STHX was investigated using simulation, with porous media inclusion. The inclusion of porous medium in the shell side is in a way that the whole tube bundle is wrapped by it; inside the tubes, porous media are located in two ways: (1) at the center of tubes and (2) fixed to the inner lining of the tubes. The findings suggest that the porous media improve the heat transfer with the expense of pressure drop; it is also noted, of all the cases, the pressure drop is minimum in anti-vibrational baffles. The analysis showed that using porous media with specific porosity and dimension can increase heat transfer rate along with less pressure drop. For the clamping anti-vibration baffles STHX, enhanced and overall effective performance was found with porous media inclusion of 0.6 porous radius ratio and porosity of 0.6.

摘要

估计并比较了三种壳管式换热器 (STHX) 的多孔介质参与增强效果，这些换热器具有螺旋、节段和夹紧抗振挡板，有两种变化，即该介质的孔隙率值和尺寸（半径）。在这项研究中，使用包含多孔介质的模拟研究了 STHX 抗振挡板设计的热工水力性能的进一步改进。壳程夹杂多孔介质，使整个管束被其包裹；在管内，多孔介质以两种方式定位：（1）在管的中心和（2）固定在管的内衬上。研究结果表明，多孔介质以压降为代价改善了传热；还应指出，在所有情况中，抗振挡板的压降最小。分析表明，使用具有特定孔隙率和尺寸的多孔介质可以提高传热速率，同时降低压降。对于夹持抗振挡板 STHX，发现多孔介质包含 0.6 的多孔半径比和 0.6 的孔隙率，增强了整体有效性能。