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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

DEVELOPMENT OF A NEW METHOD TO STUDY CONDENSATION HEAT TRANSFER IN FINE PASSAGES

Get access (open in a dialog) DOI: 10.1615/IHTC11.420
pages 341-346

Resumo

With the popularisation of compact heat exchangers and other process intensification techniques, a need for more accurate data on condensation heat transfer rates has arisen. The objective of the present study is to determine rates and mechanisms of How condensation heat transfer within narrow diameter (< 2.0 mm) passages. To obtain valid data, laboratory experiments are being carried out utilising single pass tubes cooled by thermoelectric devices. The test section was divided into ten separate zones in order to observe pseudo-local heat transfer. Calibration of the equipment has produced very consistent temperature profiles with minimal ambient heat loss and heat transfer between zones. Cooling heat transfer rates for laminar single phase water flows are in very good agreement with predicted rates, giving confidence that this method will provide a powerful tool for investigating flow condensation. Preliminary flow condensation results for HCFC-123 indicate minimal impact of saturation temperature and pressure on heat transfer rates, however changes in mass and heat fluxes have great influence over heat transfer, especially at high vapour qualities. Vapour qualities ranging from pure vapour to pure liquid, mass fluxes of 50-400 kg.m-2s-1, and heat fluxes of 10-40 kW.m-2 have been studied with the current experimental setup.