Direct contact condensation of steam jet in crossflow of water in a vertical pipe. Experimental investigation on condensation regime diagram and jet penetration length.pdfVIP

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Direct contact condensation of steam jet in crossflow of water in a vertical pipe. Experimental investigation on condensation regime diagram and jet penetration length.pdf

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Direct contact condensation of steam jet in crossflow of water in a vertical pipe. Experimental investigation on condensation regime diagram and jet penetration length.pdf

International Journal of Heat and Mass Transfer 94 (2016) 528–538 Contents lists available at ScienceDirect International Journal of Heat and Mass Transfer journal homepage: /locate/ijhmt Direct contact condensation of steam jet in cross?ow of water in a vertical pipe. Experimental investigation on condensation regime diagram and jet penetration length Qiang Xu, Liejin Guo ? State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China article info Article history: Received 20 October 2014 Received in revised form 11 February 2015 Accepted 12 February 2015 Available online 2 March 2015 Keywords: Direct contact condensation Steam jet Cross?ow Condensation regime diagram Jet penetration length abstract The direct contact condensation of jets in ?uid has been of great importance in many industrial applications. Experiments on condensing jets in initially stagnant ?uid in pool have increased signi?cantly in sophistication over the last few decades. For condensing jets in cross?ow, however, the ?ow and geometry characteristics of the jet might be fundamentally different due to the complex convection effect induced by the cross?ow. Here, experiments are performed to investigate direct contact condensation of steam jet in cross?ow of water in a vertical pipe. The condensation regime diagram and jet penetration length are investigated visually by using high-speed camera and image processing methods. The condensation regime diagram mainly contains three kinds of condensation regime, i.e., chugging, condensation oscillation and stable condensation (i.e., stable conical shape, stable cylinder shape and stable expansion shape). The condensation regime is not only affected by steam mass ?ux and water temperature, but also affected signi?cantly by Reynolds number of water ?ow. Therefore, condensation regime diagrams for different Reynolds number of water ?ow are developed. Both the regions of the chugging and condensation oscillation