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Início Arquivos Thermal Letter Representantes Futuras reuniões Assembléia das Conferências Internacionais de Transferência de Calor
International Heat Transfer Conference 3
1966, 7-12 August, Chicago, USA

THE EFFECT OF A 180° BEND ON HEAT TRANSFER TO WATER IN A TUBE

Get access DOI: 10.1615/IHTC3.1620
pages 99-103

Resumo

U bends in heat exchanger tubes may influence performance.
The effect of a 180° bend on the local heat-transfer coefficient between a tube and water flowing through it was investigated. Three bends of radius ratios 4:1, 8:1 and 22:1 at Re = 700 to 42 000 were used.
Curves of tube temperature or local heat-transfer coefficient against position along tube for turbulent, laminar and transitional flow are discussed. Particularly striking effects are obtained with laminar and transitional flow.
A design chart is given, from which it should be possible to make reasonably reliable predictions of results for other bends and Reynolds numbers.
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