An Experimental Investigation of the Pressure Loss in Flow Through Helical Coils

Author: Weatherup, Robert Alexander

Year: 1949

Degree: Engineer's thesis

Advisor: Seifert, Howard S.

Committee Member: Unknown, Unknown

Option: Aeronautics

DOI: 10.7907/KZ8G-V819

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.

This thesis is a report of an experimental investigation of pressure losses in flow through helical coils of circular cross section. The investigation aimed at the determination of a multiplying factor [...] which could be applied to the friction factor for an equivalent straight pipe in order to determine the effective friction factor for flow through a helical coil.

The following conclusions were reached:

  1. The multiplicative factor [...] is a function of Reynolds number and has a minimum value at a Reynolds number of approximately 8,000.

  2. The factor [...] is also dependent on the ratio [...]. The general effect of this ratio is to increase [...] as the ratio [...] is decreased. At Reynolds numbers above 8,000, however, [...] was found to be rather insensitive to variation in [...] over the range from [...] with a minimum at [...].

  3. The factor [...] was found to be independent of the ratios [...] and [...] over the ranges investigated.

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