The bending of a receiver tube in two-phase flow under stratified conditions when water is first introduced to the hot steel receiver of a 14.5-m long parabolic trough concentrator is presented in this paper. Thermal gradients were observed on the absorber wall at the inlet of the receiver tube during the boiling of water, at low mass flow of (1 liter/min), and low pressure It should be noted that the solar concentrator was focused on the receiver tube, which contained static air before the water was introduced. The introduction of the water produced a change in the temperature difference between the upper and lower sides of the receiver, from 40-60 K to much lower temperatures, in about 45 seconds. The bending of the steel receiver tube occurred when the two-phase flow began. Maximum deflection was observed when the thermal gradient reached a minimum value. We conclude that, when the flow of steam, water, and air exist in a stratified pattern, the combination of these three elements produces the bending phenomenon. The theoretical model, developed to evaluate the experimental data, confirms that the change in temperature gradient produces the bending of the steel receiver tube during this transient stage.
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DSG Under Two-Phase and Stratified Flow in a Steel Receiver of a Parabolic Trough Collector
Rafael Almanza,
e-mail: ras@pumas.iingen.unam.mx
Rafael Almanza
Instituto de Ingenierı´a, Universidad Nacional Auto´noma de Me´xico, Ciudad Universitaria, Coyoaca´n, D.F. 04510, Mexico
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Gustavo Jime´nez,
Gustavo Jime´nez
Instituto de Ingenierı´a, Universidad Nacional Auto´noma de Me´xico, Ciudad Universitaria, Coyoaca´n, D.F. 04510, Mexico
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Alvaro Lentz,
Alvaro Lentz
Instituto de Ingenierı´a, Universidad Nacional Auto´noma de Me´xico, Ciudad Universitaria, Coyoaca´n, D.F. 04510, Mexico
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Alberto Valde´s,
Alberto Valde´s
Universidad Auto´noma Metropolitana, Av. Michoaca´n y la Purı´sima, Iztapalapa D.F. 09340, Mexico
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Alberto Soria
Alberto Soria
Universidad Auto´noma Metropolitana, Av. Michoaca´n y la Purı´sima, Iztapalapa D.F. 09340, Mexico
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Rafael Almanza
Instituto de Ingenierı´a, Universidad Nacional Auto´noma de Me´xico, Ciudad Universitaria, Coyoaca´n, D.F. 04510, Mexico
e-mail: ras@pumas.iingen.unam.mx
Gustavo Jime´nez
Instituto de Ingenierı´a, Universidad Nacional Auto´noma de Me´xico, Ciudad Universitaria, Coyoaca´n, D.F. 04510, Mexico
Alvaro Lentz
Instituto de Ingenierı´a, Universidad Nacional Auto´noma de Me´xico, Ciudad Universitaria, Coyoaca´n, D.F. 04510, Mexico
Alberto Valde´s
Universidad Auto´noma Metropolitana, Av. Michoaca´n y la Purı´sima, Iztapalapa D.F. 09340, Mexico
Alberto Soria
Universidad Auto´noma Metropolitana, Av. Michoaca´n y la Purı´sima, Iztapalapa D.F. 09340, Mexico
Contributed by the Solar Energy Division of the American Society of Mechanical Engineers for publication in the ASME JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received by the ASME Solar Energy Division, Feb. 2000; final revision May 2001. Associate Editor. T. Mancini.
J. Sol. Energy Eng. May 2002, 124(2): 140-144 (5 pages)
Published Online: April 24, 2002
Article history
Received:
February 1, 2000
Revised:
May 1, 2001
Online:
April 24, 2002
Citation
Almanza, R., Jime´nez , G., Lentz, A., Valde´s , A., and Soria, A. (April 24, 2002). "DSG Under Two-Phase and Stratified Flow in a Steel Receiver of a Parabolic Trough Collector ." ASME. J. Sol. Energy Eng. May 2002; 124(2): 140–144. https://doi.org/10.1115/1.1463734
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