Visual experimental research on the effect of nozzle orifice structure on R124–DMAC absorption process in a vertical bubble tube |
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| Affiliation: | 1. McKetta Department of Chemical Engineering, University of Texas, 200 E. Dean Keeton St., Austin, TX 78712, USA;2. Energy Institute at the University of Texas, 2304 Whitis Avenue, Austin, TX 78712, USA;1. School of Energy and Environment, Southeast University, Nanjing 210096, China;2. Ministry of Education of Engineering Research Center of Building Environment, Energy and Equipment, Southeast University, Nanjing 210096, China;3. Shuangliang Eco-Energy Systems Co., Ltd., Jiangyin 214444, China;1. Key Laboratory of Biomedical Functional Materials, School of Science, China Pharmaceutical University, Nanjing, 211198, PR China;2. Tibetan Medicine Research Institute, Tibetan Traditional Medical College, Tibet, 850000, PR China;3. Department of Chemistry and Chemical Engineering, Shaoxing University, Shaoxing, 312000, PR China |
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| Abstract: | A visual experimental platform for R124–DMAC bubble absorption in a vertical tube absorber was designed and built for this research. The bubble behaviors, flow pattern characteristics and distributions are observed and the bubble absorption heights (BAHs) were measured when the two kinds of different structure nozzles (single-orifice or multi-orifice nozzle) were applied in the absorber. The results showed that the BAH will heighten with increases of vapor flow rate and nozzle flow area. Based on visual experimental observations, the BAH or bubble absorption performance was significantly affected by the velocity of vapor from the nozzle rather than by the nozzle structure. The proportion of slug flow in BAH or the BAH can be decreased by using a multi-orifice nozzle in the absorber under the same flow area condition. However, the flow resistance of the vapor through the nozzle will increase, which has a negative action on the performance of absorption refrigeration systems. So, using multi-orifice nozzle does not improve the absorption performance of the bubble absorber under the same nozzle flow resistance condition. |
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