Effect Of Inclination On Flow And Thermal
Characteristics Of Air-water Two-phase Flow:
An Experimental Investigation
Author(s)
M. J. Vaze & J. Banerjee
Abstract
An experimental analysis towards establishing the effect of inclination on flow
and thermal characteristics of air-water two-phase flow is presented. The
experimental setup consists of a mixing section, a visualization section, a test
section and an outlet section. The test section consists of two sets of pressure
transducers, heater element and RTD sensors for surface temperature and inlet
and outlet bulk fluid temperature measurements. The test setup can be inclined
maximum up to 30º of inclination. Various flow patterns like stratified, slug,
plug, wavy, annular and other mixed type are observed and captured at 0º, 2º, 5º
and 7º for the range of the liquid (ReSL) and gas (ReSG) superficial Reynolds
numbers of 500-10000 and 500-30000 respectively. Flow regime map is
established based on this flow visualization. For inclined configuration the
stratified regime is observed to be replaced by slug and slug/wavy type of flow
regime and the transition between slug-plug and slug-slug/wavy takes place at
higher Reynolds numbers. Surface and bulk fluid temperatures are recorded for
constant wall heat flux condition, by varying the superficial Reynolds numbers
of gas and liquid phases to establish the local and average two-phase heat
transfer coefficient. It is observed that ReSL has a pronounced effect on heat
transfer coefficient in comparison to ReSG. With the change in inclination this
effect becomes more evident. A heat transfer correlation is deduced from the
present experimental observation which includes the basic parameters like
Reynolds number and Prandtl number, pressure drop and inclination effect.
Keywords: two-phase flow, flow pattern, heat transfer, superficial Reynolds
number, inclination.
Keywords
two-phase flow, flow pattern, heat transfer, superficial Reynolds
number, inclination
Related Book
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