Abstract
The crossed beam cross-correlation method offers the possibility to measure flow parameters locally and non-intrusively, within a two-component flow. This is achieved by evaluating the cross-correlation function from two signals, which have been formed by modulation of two, within the flow, crossing radiation beams. The modulation is caused by a binary, stochastic variation of some parameter (e.g. density) in the flow, affecting the radiation beam in some measurable way. Using this method, three important two-component flow parameters can be determined simultaneously: (1) Disturbance (e.g. void) fraction, (2) interfacial velocity and (3) maximum disturbance (e.g. bubble) size. A number of experiments have been performed in order to verify the theoretical expectations on the crossed beam cross-correlation method. In the described experiments, laser beams have been used as information carriers and the two-component flow has consisted of either solid particles falling in air or water with air bubbles. The results from these experiments look very promising and, at least for the examined cases, it can be stated that the method really works. An overview of the formerly presented, general principle of the crossed beam cross-correlation method is given and a newly developed theory for applications using laser beams is presented in detail.
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Citation Formats
Thomson, O.
Laser measurements on two-component flow using the crossed beam cross-correlation method.
Sweden: N. p.,
1993.
Web.
Thomson, O.
Laser measurements on two-component flow using the crossed beam cross-correlation method.
Sweden.
Thomson, O.
1993.
"Laser measurements on two-component flow using the crossed beam cross-correlation method."
Sweden.
@misc{etde_10102932,
title = {Laser measurements on two-component flow using the crossed beam cross-correlation method}
author = {Thomson, O}
abstractNote = {The crossed beam cross-correlation method offers the possibility to measure flow parameters locally and non-intrusively, within a two-component flow. This is achieved by evaluating the cross-correlation function from two signals, which have been formed by modulation of two, within the flow, crossing radiation beams. The modulation is caused by a binary, stochastic variation of some parameter (e.g. density) in the flow, affecting the radiation beam in some measurable way. Using this method, three important two-component flow parameters can be determined simultaneously: (1) Disturbance (e.g. void) fraction, (2) interfacial velocity and (3) maximum disturbance (e.g. bubble) size. A number of experiments have been performed in order to verify the theoretical expectations on the crossed beam cross-correlation method. In the described experiments, laser beams have been used as information carriers and the two-component flow has consisted of either solid particles falling in air or water with air bubbles. The results from these experiments look very promising and, at least for the examined cases, it can be stated that the method really works. An overview of the formerly presented, general principle of the crossed beam cross-correlation method is given and a newly developed theory for applications using laser beams is presented in detail. The experimental set-up and results are described and finally, a discussion on further developments of the method is given. 10 refs, 18 figs, 8 tabs.}
place = {Sweden}
year = {1993}
month = {Nov}
}
title = {Laser measurements on two-component flow using the crossed beam cross-correlation method}
author = {Thomson, O}
abstractNote = {The crossed beam cross-correlation method offers the possibility to measure flow parameters locally and non-intrusively, within a two-component flow. This is achieved by evaluating the cross-correlation function from two signals, which have been formed by modulation of two, within the flow, crossing radiation beams. The modulation is caused by a binary, stochastic variation of some parameter (e.g. density) in the flow, affecting the radiation beam in some measurable way. Using this method, three important two-component flow parameters can be determined simultaneously: (1) Disturbance (e.g. void) fraction, (2) interfacial velocity and (3) maximum disturbance (e.g. bubble) size. A number of experiments have been performed in order to verify the theoretical expectations on the crossed beam cross-correlation method. In the described experiments, laser beams have been used as information carriers and the two-component flow has consisted of either solid particles falling in air or water with air bubbles. The results from these experiments look very promising and, at least for the examined cases, it can be stated that the method really works. An overview of the formerly presented, general principle of the crossed beam cross-correlation method is given and a newly developed theory for applications using laser beams is presented in detail. The experimental set-up and results are described and finally, a discussion on further developments of the method is given. 10 refs, 18 figs, 8 tabs.}
place = {Sweden}
year = {1993}
month = {Nov}
}