Masters Theses

Kun-chieh Lee

Abstract

"The effect of additives, aging, shear and peptizing agents on the drag reducing abilities of aluminum disoaptoluene solutions prepared at room temperature were studied. Viscosity measurements were used as a primary test to select effective additives. Medium strong organic bases were found to be useful as they speed up the dissolution of slow dissolving aluminum dioctoate soap and form large micelle structures. These peptizers are not effective with aluminum distearate which is very hard to dissolve in toluene at room temperature. Turbulent flow pressure drop measurements at various aging times were made for solutions of 0.1 per cent aluminum dioleate in toluene with and without crotyl chloride and 0.05 per cent aluminum dioctoate (two soaps with different fatty acid contents) with and without additives (allyl alcohol,crotyl chloride and crotyl aldehyde) all in a 0.03 inch tube. In some cases the additives improved the drag reducing characteristics and in others they had an adverse effect. Aluminum dioctoate was also mixed with aluminum dioleate in various proportions to study the aging and drag reducing characteristics of mixed soap systems. The addition of dioleate stabilized the dioctoate solutions and improved their drag reducing characteristics. The presence of small amounts of water with and without additives also affects drag reducing behavior. A critical shear stress region in which soap structure rapidly degrades and loses its drag reducing ability and which is analogous to the behavior of aqueous soap solutions was observed in the hydrocarbon solutions studied. In these systems the rate of reformation of the soap structure which is effective for drag reduction is a slow process, with days or weeks required for recovery. The highest values observed for critical shear stress were for 60 day old solutions of the slow dissolving aluminum dioctoate or younger solutions of this soap which had aluminum dioleate, crotyl chloride or crotyl aldehyde additives present. Critical shear stresses close to 2,500 dynes/cm² and drag ratios as low as 0.33 were observed"--Abstract, pages ii-iii .

Advisor(s)

Zakin, J. L.

Committee Member(s)

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

Department(s)

Chemical and Biochemical Engineering

Degree Name

M.S. in Chemical Engineering

Publisher

University of Missouri--Rolla

Publication Date

1970

Pagination

x, 95 pages

Note about bibliography

Includes bibliographical references (pages 32-33).

Rights

© 1970 Kun-chieh Lee, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

SoapDrag (Aerodynamics)Surface active agentsAdsorption

Thesis Number

T 2471

Print OCLC #

6028378

Electronic OCLC #

869552012

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