Masters Theses

Jen-Lin Chang

Abstract

"The use of polyoxyethylene alcohol non-ionic surfactants as drag reducing additives in aqueous systems was investigated. Significant drag reduction was obtained with suitable combinations of one percent Alfonic 1214 and salts at 30°C such that the surfactant was near or above its upper critical solubility temperature. Maximum drag reduction was observed at the cloud point. Relative viscosity values also peaked at this point. No upper critical shear stress was attained up to wall shear stresses of 2,000 dynes/cm2 with one percent Alfonic 1214 solutions at their cloud points.

At a fixed temperature, the salt concentration required to reach the cloud point is sensitive to the nature of the anion, but is less sensitive to the nature of the cation. Some sensitivity to pH was also observed. The cloud point is not sensitive to the concentration of the surfactant at concentrations below one percent.

At 0.5 percent Alfonic 1214, upper critical shear stresses were observed even with solutions at their cloud points. The mechanical degradation is only temporary, however, and drag reduction ability is regained when the shear stress is lowered"--Abstract, page ii.

Advisor(s)

Zakin, J. L.

Committee Member(s)

Bertrand, Gary L.
Venable, Raymond L., 1935-2008
Patterson, G. K. (Gary Kent), 1939-

Department(s)

Chemical and Biochemical Engineering

Degree Name

M.S. in Chemical Engineering

Publisher

University of Missouri--Rolla

Publication Date

1972

Pagination

ix, 63 pages

Note about bibliography

Includes bibliographical references (pages 61-62).

Rights

© 1972 Jen-Lin Chang, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Drag (Aerodynamics)
Surface active agents -- Analysis
Solution (Chemistry)

Thesis Number

T 2834

Print OCLC #

6027890

Electronic OCLC #

907948441

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