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Journal of Enhanced Heat Transfer
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ISSN Imprimir: 1065-5131
ISSN En Línea: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v24.i1-6.30
pages 47-62

ENHANCED HEAT TRANSFER IN NUCLEATE POOL BOILING OF AQUEOUS SURFACTANT AND POLYMERIC SOLUTIONS

Vivek M. Wasekar
Department of Mechanical, Industrial and Nuclear Engineering, University of Cincinnati, Cincinnati, OH 45221-0072, USA
Raj M. Manglik
Thermal-Fluids and Thermal Processing Laboratory, Mechanical and Materials Engineering, University of Cincinnati, 2600 Clifton Ave, Cincinnati, OH 45220, USA

SINOPSIS

The presence of surfactant or polymer additives at low concentrations in water has been found to enhance the nucleate boiling heat transfer coefficient significantly. Traces of these additives cause no significant change in thermo-physical properties of the solvent except for surface tension and/or apparent viscosity. However, the boiling behavior of the solution is changed appreciably, and the extent of enhancement has been found to be dependent on additive concentration, its type and chemistry, wall heat flux, and the heater geometry. Several mechanisms have been proposed to explain the observed enhancement, that include, among others, effects of dynamic surface tension, Marangoni convection resulting from the variation of the surface tension along the vapor-liquid interface, increased number of active nucleation sites, and change in kinetics of vapor formation. With surface-active or surface-tension decreasing agents in water, nucleate boiling is generally characterized by the formation of smaller-size bubbles with increased departure frequencies, and a decreased tendency to coalesce that causes considerable foaming. This paper discusses these and several other issues, as well as presents new experimental findings in reviewing the current status of pool boiling research with surfactant/polymer additives in water.


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