Analysis of In–line Tube Bundle Heat Transfer to Vertical Foam Flow
Liquid or gas (single phase coolant) is widely used for heat removal in heat exchangers. Nevertheless usage of two–phase system (foam flow – particulary) as a coolant in some cases allows achieving better results: smaller coolant mass flow rate, relatively large heat transfer rate, low energy consumption required for coolant delivery to heat transfer place and etc.. An experimental study of the in–line tube bundle heat transfer to the vertically upward and downward after 180 degree turn laminar foam flow was performed. One type of gas–liquid foam–statically stable foam flow was used as a coolant during the experiments. It was determined dependence of heat transfer intensity on flow parameters: flow velocity, direction of flow, volumetric void fraction of foam and influence of liquid drainage from foam. Apart of this, influence of tube position of the bundle to heat transfer was investigated. Results of the investigation showed, that heat transfer intensity of the in–line tube bundle to the foam flow is much higher than to the one–phase airflow under the same flow velocity. Heat transfer intensity of the frontal and further tubes to vertical foam flow is different in comparison with one–phase fluid flow.
Heat transfer Foam flow Flow turn In–line tube bundle Experimental channel
Jonas Gylys Stasys Sinkunas Tadas Zdankus Vidmantas Giedraitis
Energy Technology Institute, Kaunas University of Technology, K. Donelaicio 20, LT–44239, Kaunas, Li Department of Thermal and Nuclear Energy, Kaunas University of Technology, K. Donelaicio 20, LT–4423
国际会议
2007杭州国际动力工程会议(The International Conference on Power Engineering 2007)
杭州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）