Abstract
In the previous paper, we showed that a circular plate with many small holes attached just downstream of the outlet of the feed water pipe is a better device for controlling the distribution of the flow rate into the branch tubes from a header in a multitube heat exchanger. It was also reported that the flow rate distribution in the case with a particular hole diameter is remarkably different from that with the other diameter. In the present experiment, to clarify the mechanism to cause the difference, the flow pattern in the header was visualized by using aluminum powder as a tracer, and the pressure distribution on the bottom wall of the header was measured. The results show that the flow rate distribution is closely related to the flow pattern in the header.
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