Is it better for the plate heat exchanger lubricant to flow in from above and out from below, or in from below and out from above?
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Customers often, due to the on-site piping layout, wish to swap the upper and lower ends of the pipes while keeping the flow direction unchanged, in order to minimize the impact on the heat exchange efficiency. May I ask everyone, does the layout of the lubricating oil interfaces affect the heat exchange efficiency? It’s the same reverse flow situation. The foreigner from the company said that other media work fine, but for oil as a medium, it’s only suitable for flow from top to bottom. Please discuss among yourselves
For foreign-made products, lubricants – I’ve seen them flow from top to bottom as well as from bottom to top.
Personally, I think it’s better for the oil to flow in from above and out from below. The operating conditions for oil coolers that are encountered generally require this.
We are manufacturers. We use lubricating oil for cooling in our presses; the oil enters from above and exits from below, while the cooling water enters from below and exits from above. It’s better for the oil to enter from above and exit from below, as its viscosity is high, and free fall helps improve its fluidity
Study*study*. In my opinion, don’t liquids generally flow from below to above, in order to fill the entire flow area? ； If fluid enters from above and exits from below, will there be some areas that are not filled with fluid? Please advise?
For materials that enter from above and exit from below, in order to avoid the phenomenon you mentioned, it is necessary to ensure an adequate flow rate. If it is not possible to maintain a sufficient amount of liquid for heat exchange, then it is better to use a configuration where materials enter from below and exit from above; this follows the same principle as ascending film and descending film processes
The liquid is distributed according to pressure, with no uneven distribution at all. There is relevant data to support it; you can check it out.
In the absence of phase change, it is possible for the temperature to increase or decrease; this has no impact on heat transfer. As for viscosity, it has already been taken into account during the selection and calculation process.