Vertical tube side air flow direction
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I would like to ask: In a vertical heat exchanger, where the heat transfer oil is used for heating in the shell side and air is used on the tube side, should the air flow from top to bottom or from bottom to top? Which flow direction provides a better heating effect?
Considering only heat transfer factors, it is logical to arrange the gas for heating from bottom to top.
Are there any disadvantages or shortcomings if it is top-down?
When a gas is heated, its density decreases, causing it to rise naturally
If the gas flows from top to bottom, wouldn’t that help prevent it from rising, thereby allowing the gas to be heated for a longer period and achieving a better heating effect? It’s just an idea; I’d appreciate some guidance from experts