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Détail de l'auteur
Auteur Tailian Chen
Documents disponibles écrits par cet auteur
Affiner la rechercheA study of critical heat flux during flow boiling in microchannel heat sinks / Tailian Chen in Journal of heat transfer, Vol. 134 N° 1 (Janvier 2012)
[article]
in Journal of heat transfer > Vol. 134 N° 1 (Janvier 2012) . - 09 p.
Titre : A study of critical heat flux during flow boiling in microchannel heat sinks Type de document : texte imprimé Auteurs : Tailian Chen, Auteur ; Suresh V. Garimella, Auteur Année de publication : 2012 Article en page(s) : 09 p. Note générale : Heat transfer Langues : Anglais (eng) Mots-clés : Boiling Bubbles Coolants Cooling Flow visualisation Heat of vaporisation Heat sinks Microchannel flow Two-phase flow Index. décimale : 536 Chaleur. Thermodynamique Résumé : The cooling capacity of two-phase transport in microchannels is limited by the occurrence of critical heat flux (CHF). Due to the nature of the phenomenon, it is challenging to obtain reliable CHF data without causing damage to the device under test. In this work, the critical heat fluxes for flow boiling of FC-77 in a silicon thermal test die containing 60 parallel microchannels were measured at five total flow rates through the microchannels in the range of 20–80 ml/min. CHF is caused by dryout at the wall near the exit of the microchannels, which in turn is attributed to the flow reversal upstream of the microchannels. The bubbles pushed back into the inlet plenum agglomerate; the resulting flow blockage is a likely cause for the occurrence of CHF which is marked by an abrupt increase in wall temperature near the exit and an abrupt decrease in pressure drop across the microchannels. A database of 49 data points obtained from five experiments in four independent studies with water, R-113, and FC-77 as coolants was compiled and analyzed. It is found that the CHF has a strong dependence on the coolant, the flow rate, and the area upon which the heat flux definition is based. However, at a given flow rate, the critical heat input (total heat transfer rate to the coolant when CHF occurs) depends only on the coolant and has minimal dependence on the details of the microchannel heat sink (channel size, number of channels, substrate material, and base area). The critical heat input for flow boiling in multiple parallel microchannels follows a well-defined trend with the product of mass flow rate and latent heat of vaporization. A power-law correlation is proposed which offers a simple, yet accurate method for predicting the CHF. The thermodynamic exit quality at CHF is also analyzed and discussed to provide insights into the CHF phenomenon in a heat sink containing multiple parallel microchannels. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000001 [...] [article] A study of critical heat flux during flow boiling in microchannel heat sinks [texte imprimé] / Tailian Chen, Auteur ; Suresh V. Garimella, Auteur . - 2012 . - 09 p.
Heat transfer
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 134 N° 1 (Janvier 2012) . - 09 p.
Mots-clés : Boiling Bubbles Coolants Cooling Flow visualisation Heat of vaporisation Heat sinks Microchannel flow Two-phase flow Index. décimale : 536 Chaleur. Thermodynamique Résumé : The cooling capacity of two-phase transport in microchannels is limited by the occurrence of critical heat flux (CHF). Due to the nature of the phenomenon, it is challenging to obtain reliable CHF data without causing damage to the device under test. In this work, the critical heat fluxes for flow boiling of FC-77 in a silicon thermal test die containing 60 parallel microchannels were measured at five total flow rates through the microchannels in the range of 20–80 ml/min. CHF is caused by dryout at the wall near the exit of the microchannels, which in turn is attributed to the flow reversal upstream of the microchannels. The bubbles pushed back into the inlet plenum agglomerate; the resulting flow blockage is a likely cause for the occurrence of CHF which is marked by an abrupt increase in wall temperature near the exit and an abrupt decrease in pressure drop across the microchannels. A database of 49 data points obtained from five experiments in four independent studies with water, R-113, and FC-77 as coolants was compiled and analyzed. It is found that the CHF has a strong dependence on the coolant, the flow rate, and the area upon which the heat flux definition is based. However, at a given flow rate, the critical heat input (total heat transfer rate to the coolant when CHF occurs) depends only on the coolant and has minimal dependence on the details of the microchannel heat sink (channel size, number of channels, substrate material, and base area). The critical heat input for flow boiling in multiple parallel microchannels follows a well-defined trend with the product of mass flow rate and latent heat of vaporization. A power-law correlation is proposed which offers a simple, yet accurate method for predicting the CHF. The thermodynamic exit quality at CHF is also analyzed and discussed to provide insights into the CHF phenomenon in a heat sink containing multiple parallel microchannels. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000001 [...] Water-heated pool boiling of different refrigerants on the outside surface of a horizontal smooth tube / Tailian Chen in Journal of heat transfer, Vol. 134 N° 2 (Fevrier 2012)
[article]
in Journal of heat transfer > Vol. 134 N° 2 (Fevrier 2012) . - 08 p.
Titre : Water-heated pool boiling of different refrigerants on the outside surface of a horizontal smooth tube Type de document : texte imprimé Auteurs : Tailian Chen, Auteur Année de publication : 2012 Article en page(s) : 08 p. Note générale : Heat transfer Langues : Anglais (eng) Mots-clés : Boiling Copper Flow measurement Heat transfer Pipe flow Refrigerants Water Index. décimale : 536 Chaleur. Thermodynamique Résumé : Pool boiling heat transfer has been extensively studied over decades, but the effect of boundary heating conditions on boiling received little attention. In this work, heat transfer coefficients during pool boiling of five different refrigerants (R123, R245fa, R236fa, R134a, and R22) on the outside surface of a smooth copper tube were measured at the saturation temperature of 6.7 °C; water flows inside the tube and provides heat to the refrigerants to boil (thus, water-heated boiling). Measurements showed that the refrigerant of a higher vapor pressure has a higher heat transfer coefficient, with the exception that R22 performs nearly the same as R134a. A correlation previously developed for electrically-heated pool boiling on cylindrical tubes underpredicts by 30%–46% the heat transfer coefficients during water-heated boiling of the five refrigerants. Among the pool boiling correlations reviewed in this work, the Cooper correlation (for pool boiling on cylindrical tubes) predicts the boiling heat transfer coefficients of R22 and R245fa reasonably well (within ±8.5%), but not as well those of the other three refrigerants (underpredicts by nearly 30% for R134a and R236fa and overpredicts by nearly 40% for R123). It is found that the predicted boiling heat transfer coefficients of the five refrigerants by the modified Gorenflo correlation (simply adding a constant multiplier of 1.47 to the Gorenflo correlation) are in excellent agreement with their respective measurements. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000002 [...] [article] Water-heated pool boiling of different refrigerants on the outside surface of a horizontal smooth tube [texte imprimé] / Tailian Chen, Auteur . - 2012 . - 08 p.
Heat transfer
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 134 N° 2 (Fevrier 2012) . - 08 p.
Mots-clés : Boiling Copper Flow measurement Heat transfer Pipe flow Refrigerants Water Index. décimale : 536 Chaleur. Thermodynamique Résumé : Pool boiling heat transfer has been extensively studied over decades, but the effect of boundary heating conditions on boiling received little attention. In this work, heat transfer coefficients during pool boiling of five different refrigerants (R123, R245fa, R236fa, R134a, and R22) on the outside surface of a smooth copper tube were measured at the saturation temperature of 6.7 °C; water flows inside the tube and provides heat to the refrigerants to boil (thus, water-heated boiling). Measurements showed that the refrigerant of a higher vapor pressure has a higher heat transfer coefficient, with the exception that R22 performs nearly the same as R134a. A correlation previously developed for electrically-heated pool boiling on cylindrical tubes underpredicts by 30%–46% the heat transfer coefficients during water-heated boiling of the five refrigerants. Among the pool boiling correlations reviewed in this work, the Cooper correlation (for pool boiling on cylindrical tubes) predicts the boiling heat transfer coefficients of R22 and R245fa reasonably well (within ±8.5%), but not as well those of the other three refrigerants (underpredicts by nearly 30% for R134a and R236fa and overpredicts by nearly 40% for R123). It is found that the predicted boiling heat transfer coefficients of the five refrigerants by the modified Gorenflo correlation (simply adding a constant multiplier of 1.47 to the Gorenflo correlation) are in excellent agreement with their respective measurements. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000002 [...] Water-heated pool boiling of different refrigerants on the outside surface of a horizontal smooth tube / Tailian Chen in Journal of heat transfer, Vol 134 N° 9 (Septembre 2012)
[article]
in Journal of heat transfer > Vol 134 N° 9 (Septembre 2012) . - 03 p.
Titre : Water-heated pool boiling of different refrigerants on the outside surface of a horizontal smooth tube Type de document : texte imprimé Auteurs : Tailian Chen, Auteur Année de publication : 2012 Article en page(s) : 03 p. Note générale : heat transfer Langues : Anglais (eng) Note de contenu : Erratum: “Water-Heated Pool Boiling of Different Refrigerants on the Outside Surface of a Horizontal Smooth Tube” [ASME Journal of Heat Transfer, 2012, 134, 021502] DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000009 [...] [article] Water-heated pool boiling of different refrigerants on the outside surface of a horizontal smooth tube [texte imprimé] / Tailian Chen, Auteur . - 2012 . - 03 p.
heat transfer
Langues : Anglais (eng)
in Journal of heat transfer > Vol 134 N° 9 (Septembre 2012) . - 03 p.
Note de contenu : Erratum: “Water-Heated Pool Boiling of Different Refrigerants on the Outside Surface of a Horizontal Smooth Tube” [ASME Journal of Heat Transfer, 2012, 134, 021502] DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JHTRAO000134000009 [...]