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| 紧凑式两相换热器中管式换热元件沸腾传热实验研究 |
| Experimental investigations on the boiling heat transfer of tubular heat transfer elements for compact two-phase heat exchangers |
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| DOI： |
| 中文关键词: 两相换热器 沸腾传热 管式换热元件 |
| 英文关键词:Heat transfer enhancement,two-phase flow,boiling,compact heat exchanger |
| 基金项目: |
| M·格罗尔 R·麦尔茨 B·特农 |
| 德国Stuttgart大学!Stuttgart 70550，德国Stuttgart大学!Stuttgart 70550，法国GRETh公司!Grenoble Cedes 9 38054 |
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| 中文摘要: |
| 以烃类物质（丙烷和正戊烷）作为工质，进行了紧凑式换热器中带有加工配置表面的管式换热元件池沸腾实验研究。其中，单管实验温度工况为２５３Ｋ￣２９３Ｋ（饱和工质）。实验中所采用的换热元件为重入式结构加工配置表面的强化传热管和光管以及低助管。针对由４５根光管或带有加工配置表面的管子所构成的叉排管束进行了实验研究，实验工质为丙烷和正戊烷，实验温度分别为两种工质在２６３Ｋ和３０８Ｋ之间的饱和和温度。并将所得实 |
| 英文摘要: |
| The application of enhanced tubes in shell-and-tube heat exchangers within the hydrocarbon processing industry has a long tradition. Presently various technologies for heat transfer enhancement are available and can be considered to be "proven technology" in specific applications fields. Furthermore, experimental investigations in the field of two-phase heat transfer surfaces for compact heat exchangers have been carrying out in cooperation of university and industrial partners. In this work, tubular heat transfer elements with structured surfaces, provided by Wieland-Werke AG, Ulm, were tested in the pool boiling mode using hydrocarbons, viz. propane and n-pentane as working fluids. Single tube experiments were carried out at IKE at saturation temperatures between 253 K and 293 K. Tubes with surfaces structured by re-entrant geometries and tubes with smooth and low-finned surfaces were investigated. At GRETh staggered bundles of 45 smooth or structured tubes were used for the experiments. The tests were carried out with propane and n-pentane at saturation temperatures between 263 K and 308 K, respectively. The experimental results were compared with predicted data of available empirical correlations. The experimental investigations show distinct improvements of the heat transfer performance if enhanced surfaces are used. Particularly for low heat fluxes up to 20 kW/m2, which are of most interest for industrial applications, very high enhance-ments are observed. |
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