What is a good way to mix throttled liquid/flash gas and hot gas in the low side of a refrigeration system to achieve a uniform superheated vapor? Both the feed streams are currently injected at a common point and then allowed to run through about 20 ft of tubing with four 180-degree return bends. There is a liquid stream rolling along the bottom of the pipe where incomplete evaporation is evident. There is insufficient room to add much additional piping. Would static mixers, which I believe are typically used for liquid blending, be of any benefit?
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Dave Dickey Forum Moderator 286 Posts
Re: Mix throttled liquid/flash gas and hot gas8 November 2006 at 1:29pmStatic mixers are defintely an option. To achieve gas liquid contacting, the velocities need to be sufficient for dispersion. Liquid velocities greater than 10 ft/sec should be adequate. A typical twisted element mixer, such as a Kenics mixer should be available for tubing in most sizes. Unless required for other heat transfer, the 20 feet of tubing can probably be reduced, rather than extended. My suggestion is to try a static mixer, analysis may be more costly than a trial. The cost should be reasonable for a static mixer.