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A Study of Pressure Drop in Helical Coils


Dwire, Oliver Scott (1949) A Study of Pressure Drop in Helical Coils. Engineer's thesis, California Institute of Technology. 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.

Item Type:Thesis (Engineer's thesis)
Subject Keywords:Aeronautics
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Seifert, Howard S.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 September 1948
Record Number:CaltechETD:etd-01232009-095750
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:309
Deposited By: Imported from ETD-db
Deposited On:26 Jan 2009
Last Modified:27 Mar 2023 23:41

Thesis Files

PDF (Dwire_os_1949.pdf) - Final Version
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