| Abstract: | Equations for predicting the gas-film coefficient for the volatilization of organic solutes from streams are developed. The film coefficient is a function of windspeed and water temperature. The dependence of the coefficient on windspeed is determined from published information on the evaporation of water from a canal. The dependence of the coefficient on temperature is determined from laboratory studies on the evaporation of water. Procedures for adjusting the coefficients for different organic solutes are based on the molecular diffusion coefficient and the molecular weight. The molecular weight procedure is easiest to use because of the availability of molecular weights. However, the theoretical basis of the procedure is questionable. The diffusion coefficient procedure is supported by considerable data. Questions, however, remain regarding the exact dependence of the film coefficint on the diffusion coefficient. It is suggested that the diffusion coefficient procedure with a 0.68-power dependence be used when precise estimate of the gas-film coefficient are needed and that the molecular weight procedure be used when only approximate estimates are needed. |
| Genre: | Article |
| ProdID: | 70011314 |
| Citation Author: | Rathbun, R. E.; Tai, D. Y. |
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| Citation End Page: | 1127 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Environmental Engineering |
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| Citation Number Of Pages: | 17 |
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| Citation Publisher: | ASCE |
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| Citation Search Results Text: | Gas-film coefficients for streams; 1983; Article; Journal; Journal of Environmental Engineering; Rathbun, R. E.; Tai, D. Y. |
| Citation Start Page: | 1111 |
| Citation Volume: | 109 |
| Citation Year: | 1983 |
| Type: | citation/reference |
| Text: | Gas-film coefficients for streams; 1983; Article; Journal; Journal of Environmental Engineering; Rathbun, R. E.; Tai, D. Y. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1061/(ASCE)0733-9372(1983)109:5(1111) |
| Date Other: | Sat, 1 Jan 1983 00:00 -0600 |
| Publisher: | ASCE |
