Masters Theses

Date of Award


Degree Type


Degree Name

Master of Science


Biosystems Engineering Technology

Major Professor

John I. Sewell

Committee Members

John J. McDow, F. C. Larson, Houston Luttrell


Model studies were conducted on the effects of tank shape,internal obstructions, and agitation time on the removal of manure slurries from liquid manure holding tanks. Peat moss was used to simulate cow manure. The models were constructed to one-fifth scale, and the relationships between model and prototype were developed from Prandtl's mixing length theory.

The results of the tests conducted in the models were expressed as the percentage of the loaded solids remaining in the tank after each cycle of agitation and removal by pumping of the suspended solids. From the standpoint of manure removal, these tests showed no significant difference between circular and rectangular tanks, long and. short agitation periods, and. the presence or absence of cover-support columns. A dividing wall baffle in the rectangular tank significantly reduced the quantity of manure which could be removed in a suspended state.

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