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    Intake flow fields for a zooplankton pump sampling system

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    Brooks_Thesis (9.235Mb)
    Date
    1979-08
    Author
    Brooks, James Ray  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/1827
    DOI
    10.1575/1912/1827
    Keyword
     Flumes; Zooplankton; Intakes; Pumping machinery 
    Abstract
    The flow fields entering intake forms oriented into a steady flume flow has been observed and quantified. This data is applied to a model of zooplankton sampler performance, to predict the fraction of the sampled fluid from which no animals will escape under conditions similar to those of the tests. Flume flow speeds (≈5 cm/s) and intake pumping rate (≈33 gal/min) are scaled by a factor of 20 in the model, while test form dimensions (4 and 7 inch throats and 12 inch outside diameters) are considered to be full-size for the prototype pump samplers. The data presented can be applied to other flow and geometrical scales. The 'lethal cone' and critical fluid deformation rate envelopes are evaluated for eleven intake forms: pointed, bullet-shaped, funnel-shaped, rounded and square-ended. The sharply-pointed intake performed test, for tow speed ≈100 cm/s, swimming speed=30 cm/s and Dc=1. 0 sec-1. 'Sure capture' is predicted in 83% of the sampled water. The four funnel-shaped forms follow consecutively in a rank ordering, with efficiencies, of 77% to 68%.
    Description
    Submitted in partial fulfillment of the requirements for the degree of Ocean Engineer at the Woods Hole Oceanographic Institution and the Massachusetts Institute of Technology and for the degree of Ocean Engineer at the Massachusetts Institute of Technology August 1979
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    • WHOI Theses
    • Applied Ocean Physics and Engineering (AOP&E)
    Suggested Citation
    Thesis: Brooks, James Ray, "Intake flow fields for a zooplankton pump sampling system", 1979-08, DOI:10.1575/1912/1827, https://hdl.handle.net/1912/1827
     

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