Abstract
Boiling of aqueous surfactant solutions is known to be drastically different from that of pure water. The experimental results showed that a small amount of surfactant additive makes the nucleate boiling heat transfer coefficient, hb, considerably higher, and that there is an optimum additive concentration for higher heat fluxes. Beyond this optimum point, further increase in additive concentration makes hb lower. In this work, the effect of surfactant additive on boiling is attributed to the departure from equilibrium surface tension which is produced by extension of the vapor-liquid interface during growth and coalescence of vapor bubbles in the vicinity of boiling surface. The surface tension of a surfactant solution is higher than the static value because the surfactant component cannot diffuse to the adsorbed layer promptly. This dynamic surface effect can be expressed by the Y (≡c(dσ/dc)2) value which is shown to be a representation of the elasticity of an adsorbed film as well. The similarity between the increment of hb due to the addition of surfactant and the Y curves indicates that the dynamic surface effect may play an important role in the boiling process of aqueous surfactant solutions.
| Original language | English |
|---|---|
| Pages (from-to) | 711-727 |
| Number of pages | 17 |
| Journal | International Communications in Heat and Mass Transfer |
| Volume | 17 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 1990 Jan 1 |
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All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Chemical Engineering(all)
- Condensed Matter Physics
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Dynamic surface effect on boiling of aqueous surfactant solutions. / Yang, Yu Min.
In: International Communications in Heat and Mass Transfer, Vol. 17, No. 6, 01.01.1990, p. 711-727.Research output: Contribution to journal › Article
TY - JOUR
T1 - Dynamic surface effect on boiling of aqueous surfactant solutions
AU - Yang, Yu Min
PY - 1990/1/1
Y1 - 1990/1/1
N2 - Boiling of aqueous surfactant solutions is known to be drastically different from that of pure water. The experimental results showed that a small amount of surfactant additive makes the nucleate boiling heat transfer coefficient, hb, considerably higher, and that there is an optimum additive concentration for higher heat fluxes. Beyond this optimum point, further increase in additive concentration makes hb lower. In this work, the effect of surfactant additive on boiling is attributed to the departure from equilibrium surface tension which is produced by extension of the vapor-liquid interface during growth and coalescence of vapor bubbles in the vicinity of boiling surface. The surface tension of a surfactant solution is higher than the static value because the surfactant component cannot diffuse to the adsorbed layer promptly. This dynamic surface effect can be expressed by the Y (≡c(dσ/dc)2) value which is shown to be a representation of the elasticity of an adsorbed film as well. The similarity between the increment of hb due to the addition of surfactant and the Y curves indicates that the dynamic surface effect may play an important role in the boiling process of aqueous surfactant solutions.
AB - Boiling of aqueous surfactant solutions is known to be drastically different from that of pure water. The experimental results showed that a small amount of surfactant additive makes the nucleate boiling heat transfer coefficient, hb, considerably higher, and that there is an optimum additive concentration for higher heat fluxes. Beyond this optimum point, further increase in additive concentration makes hb lower. In this work, the effect of surfactant additive on boiling is attributed to the departure from equilibrium surface tension which is produced by extension of the vapor-liquid interface during growth and coalescence of vapor bubbles in the vicinity of boiling surface. The surface tension of a surfactant solution is higher than the static value because the surfactant component cannot diffuse to the adsorbed layer promptly. This dynamic surface effect can be expressed by the Y (≡c(dσ/dc)2) value which is shown to be a representation of the elasticity of an adsorbed film as well. The similarity between the increment of hb due to the addition of surfactant and the Y curves indicates that the dynamic surface effect may play an important role in the boiling process of aqueous surfactant solutions.
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UR - http://www.scopus.com/inward/citedby.url?scp=0025521271&partnerID=8YFLogxK
U2 - 10.1016/0735-1933(90)90018-F
DO - 10.1016/0735-1933(90)90018-F
M3 - Article
VL - 17
SP - 711
EP - 727
JO - International Communications in Heat and Mass Transfer
JF - International Communications in Heat and Mass Transfer
SN - 0735-1933
IS - 6
ER -