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A Caltech Library Repository Feedhttp://www.rssboard.org/rss-specificationpython-feedgenenWed, 06 Dec 2023 15:16:22 +0000An Experimental Investigation of the Pressure Loss in Flow Through Helical Coils
https://resolver.caltech.edu/CaltechETD:etd-02052009-133758
Authors: Weatherup, Robert Alexander
Year: 1949
DOI: 10.7907/KZ8G-V819
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.https://thesis.library.caltech.edu/id/eprint/512A Study of Pressure Drop in Helical Coils
https://resolver.caltech.edu/CaltechETD:etd-01232009-095750
Authors: Dwire, Oliver Scott
Year: 1949
DOI: 10.7907/GV93-7D64
This study was made to investigate the increase in pressure drop through a helix over that through a straight pipe and to study the variables involved. The pressure drops in ten helices and seven straight pipes were observed over a range of Reynolds Numbers.
The results indicate that the increase in pressure drop due to the helical shape is a function of tube diameter, helix diameter, relative roughness, and possibly Reynolds Number. There is some indication that relative roughness may be the most important of these variables. However, the data obtained are insufficient to justify the formulation of an empirical equation for the curvature correction.https://thesis.library.caltech.edu/id/eprint/309