Thermal entry length in falling liquid film

Author: Chinnov E.  

Publisher: MAIK Nauka/Interperiodica

ISSN: 1063-7850

Source: Technical Physics Letters, Vol.37, Iss.8, 2011-08, pp. : 776-779

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Abstract

The variation in thermal entry length (TEL) in a heated liquid film flowing down a vertical plate has been experimentally studied for high Reynolds numbers of the flow. Even at low heat fluxes, zones with a temperature exceeding the initial temperature of the film are formed at a distance of ∼7 mm from the upper edge of the heater in the region between rivulets, which is formed between the crests of developed three-dimensional synchronous waves. In rivulets passing along the crests of these waves, the TEL is greater, but it rapidly decreases with increasing heat flux density.