Surfactant-induced retardation of the thermocapillary flow at a gas/liquid interface

Tzu Chiang Wu, Yu Min Yang, Jer Ru Maa

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Systematic study of soluble surfactant effect on the thermocapillary flow that artificially provoked by a steady point heat source at a gas/liquid interface was performed experimentally. Surface velocity and temperature profiles were measured at three ΔTs (temperature difference between heated source and bulk solution) for pure water and SDS solutions of five concentrations. Experimental results show that small amounts of SDS in water retard significantly the thermocapillary flow and consequently alter the surface velocity and temperature profiles. The dependence of the average interfacial Reynolds number ratio, Re(S)/ReW, and average temperature difference ratio, (Θ(S)-Θ(C))/(ΘW-Θ(C)), on ΔT and C can be satisfactorily represented by proposed empirical correlations. Moreover, mechanism of retardation by surfactant for thermocapillary and diffusocapillary flows is found to be quite different. While surfactant-induced retardation on the thermocapillary flow is due to the interfacial elasticity property of surfactant solutions, that of the diffusocapillary, on the other hand, is mainly due to the reduction in the driving force that triggers the diffusocapillary flow. (C) 2000 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)655-666
Number of pages12
JournalInternational Communications in Heat and Mass Transfer
Volume27
Issue number5
DOIs
Publication statusPublished - 2000 Jul 1

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Surface-Active Agents
Surface active agents
Gases
surfactants
Liquids
liquids
gases
temperature profiles
temperature gradients
Temperature
velocity distribution
Water
Elasticity
heat sources
Reynolds number
water
elastic properties
actuators

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

Cite this

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abstract = "Systematic study of soluble surfactant effect on the thermocapillary flow that artificially provoked by a steady point heat source at a gas/liquid interface was performed experimentally. Surface velocity and temperature profiles were measured at three ΔTs (temperature difference between heated source and bulk solution) for pure water and SDS solutions of five concentrations. Experimental results show that small amounts of SDS in water retard significantly the thermocapillary flow and consequently alter the surface velocity and temperature profiles. The dependence of the average interfacial Reynolds number ratio, Re(S)/ReW, and average temperature difference ratio, (Θ(S)-Θ(C))/(ΘW-Θ(C)), on ΔT and C can be satisfactorily represented by proposed empirical correlations. Moreover, mechanism of retardation by surfactant for thermocapillary and diffusocapillary flows is found to be quite different. While surfactant-induced retardation on the thermocapillary flow is due to the interfacial elasticity property of surfactant solutions, that of the diffusocapillary, on the other hand, is mainly due to the reduction in the driving force that triggers the diffusocapillary flow. (C) 2000 Elsevier Science Ltd.",
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Surfactant-induced retardation of the thermocapillary flow at a gas/liquid interface. / Wu, Tzu Chiang; Yang, Yu Min; Maa, Jer Ru.

In: International Communications in Heat and Mass Transfer, Vol. 27, No. 5, 01.07.2000, p. 655-666.

Research output: Contribution to journalArticle

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AB - Systematic study of soluble surfactant effect on the thermocapillary flow that artificially provoked by a steady point heat source at a gas/liquid interface was performed experimentally. Surface velocity and temperature profiles were measured at three ΔTs (temperature difference between heated source and bulk solution) for pure water and SDS solutions of five concentrations. Experimental results show that small amounts of SDS in water retard significantly the thermocapillary flow and consequently alter the surface velocity and temperature profiles. The dependence of the average interfacial Reynolds number ratio, Re(S)/ReW, and average temperature difference ratio, (Θ(S)-Θ(C))/(ΘW-Θ(C)), on ΔT and C can be satisfactorily represented by proposed empirical correlations. Moreover, mechanism of retardation by surfactant for thermocapillary and diffusocapillary flows is found to be quite different. While surfactant-induced retardation on the thermocapillary flow is due to the interfacial elasticity property of surfactant solutions, that of the diffusocapillary, on the other hand, is mainly due to the reduction in the driving force that triggers the diffusocapillary flow. (C) 2000 Elsevier Science Ltd.

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