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Matching the refractive index [in] density stratified flows

Hannoun, Imad (1985) Matching the refractive index [in] density stratified flows. California Institute of Technology , Pasadena, CA. (Unpublished)

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The use of optical methods such as Laser Doppler Velocimetry (LDV) and laser induced fluorescence techniques (LIF) in experimental fluid mechanics is becoming very common. The greatest advantage of such methods is that measurements are made without disturbing the flow. A major impediment to using optical methods to study density stratified flows is the variation of the refractive index within the flow field. McDougall (1979a) has proposed a method for the reduction of refractive index variations while maintaining a density difference. The method relies on the fact that various solutes in, say, water can contribute to the density and to the refractive index of the solution in different proportions. A new pair of solutes (ethanol and NaCl) were found to be suitable for use in LDV and LIF studies of stratified flows. In some circumstances the new pair is more useful than that described by McDougall (1979a).

Item Type:Report or Paper (Technical Report)
Additional Information:Supported by: National Science Foundation Grant Number CEE84-12641
Group:W. M. Keck Laboratory of Hydraulics and Water Resources
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Record Number:CaltechKHR:KH-TM-85-1
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Usage Policy:You are granted permission for individual, educational, research and non-commercial reproduction, distribution, display and performance of this work in any format.
ID Code:26022
Deposited By: Imported from CaltechKHR
Deposited On:22 Aug 2011
Last Modified:10 Dec 2020 20:59

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