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Title: Van der waals forces on thin liquid films in capillary tubes

Abstract

A theory of the van der Waals attraction between a thin liquid films and a capillary tube is presented assuming the presence of a vapor-liquid interface. The model is based on the surface mode analysis method of van Kampen et al. Values for the van der Waals interaction energy per unit area were calculated for liquid films of pentane on a gold substrate assuming a thin liquid film. Results indicate that the effect of capillary curvature on the van der Waals interaction increases as the ratio of the liquid film thickness to the capillary radius is increased. This trend is consistent with predictions based on the Hamaker theory. Deviations from results based on the Hamaker theory are easily explained in terms of retardation of the van der Waals interaction. Because the effect of capillary curvature increases in the regime where retardation effects become important, curvature effects constitute a small correction to the van der Waals forces in a capillary tube.

Authors:
 [1];  [2]
  1. (National Renewable Energy Lab., Golden, CO (United States))
  2. (Heat Transfer Research, Inc., College Station, TX (United States))
Publication Date:
OSTI Identifier:
5769185
Resource Type:
Journal Article
Journal Name:
Journal of Colloid and Interface Science; (United States)
Additional Journal Information:
Journal Volume: 160:1; Journal ID: ISSN 0021-9797
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; CAPILLARY FLOW; VAN DER WAALS FORCES; FLUID MECHANICS; GOLD; MATHEMATICAL MODELS; PENTANE; POROUS MATERIALS; THIN FILMS; TUBES; ALKANES; ELEMENTS; FILMS; FLUID FLOW; HYDROCARBONS; MATERIALS; MECHANICS; METALS; ORGANIC COMPOUNDS; TRANSITION ELEMENTS; 420400* - Engineering- Heat Transfer & Fluid Flow

Citation Formats

Herdt, G.C., and Swanson, L.W.. Van der waals forces on thin liquid films in capillary tubes. United States: N. p., 1993. Web. doi:10.1006/jcis.1993.1369.
Herdt, G.C., & Swanson, L.W.. Van der waals forces on thin liquid films in capillary tubes. United States. doi:10.1006/jcis.1993.1369.
Herdt, G.C., and Swanson, L.W.. Fri . "Van der waals forces on thin liquid films in capillary tubes". United States. doi:10.1006/jcis.1993.1369.
@article{osti_5769185,
title = {Van der waals forces on thin liquid films in capillary tubes},
author = {Herdt, G.C. and Swanson, L.W.},
abstractNote = {A theory of the van der Waals attraction between a thin liquid films and a capillary tube is presented assuming the presence of a vapor-liquid interface. The model is based on the surface mode analysis method of van Kampen et al. Values for the van der Waals interaction energy per unit area were calculated for liquid films of pentane on a gold substrate assuming a thin liquid film. Results indicate that the effect of capillary curvature on the van der Waals interaction increases as the ratio of the liquid film thickness to the capillary radius is increased. This trend is consistent with predictions based on the Hamaker theory. Deviations from results based on the Hamaker theory are easily explained in terms of retardation of the van der Waals interaction. Because the effect of capillary curvature increases in the regime where retardation effects become important, curvature effects constitute a small correction to the van der Waals forces in a capillary tube.},
doi = {10.1006/jcis.1993.1369},
journal = {Journal of Colloid and Interface Science; (United States)},
issn = {0021-9797},
number = ,
volume = 160:1,
place = {United States},
year = {1993},
month = {10}
}