High-Speed photographic observation of flow boiling of water in parallel mini-channels
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Date
2001-06Author
Kandlikar, Satish
Steinke, Mark
Tian, Shurong
Campbell, Levi
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Show full item recordAbstract
The use of smaller passage dimensions is becoming more
prevalent in flow boiling applications. Passages with hydraulic
diameters on the order of 1mm provide higher heat transfer
coefficients resulting in more compact heat exchanger
arrangements. Passages with 1mm hydraulic diameters do not
pose severe clogging or blocking constraints as opposed to
micro-channels and have a less pronounced pressure drop
penalty. The present paper explores the flow regimes during
flow boiling of water in mini-channels. High-speed photography
is used to obtain visual pictures of the flow phenomena from
subcooled flow boiling all the way to critical heat flux
conditions. The tests include one single-channel and a set of six
parallel channels with electric heating from three sides of the
channel. The top cover is made of Lexan to permit visual
observations. The results are used to identify specific features
of flow boiling in smaller diameter mini-channels.
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