[article] 
inJournal of heat transfer > Vol. 132 N° 4 (n° spécial) (Avril 2010) . - pp. [041010-1/12]

Titre :	Representative results for condensation measurements at hydraulic diameters ~100 microns
Type de document :	texte imprimé
Auteurs :	Akhil Agarwal, Auteur ; Srinivas Garimella, Auteur
Article en page(s) :	pp. [041010-1/12]
Note générale :	Physique
Langues :	Anglais (eng)
Mots-clés :	Condensation Microchannels Measurement Heat transfer Pressure drop refrigerants
Index. décimale :	536 Chaleur. Thermodynamique
Résumé :	Condensation pressure drops and heat transfer coefficients for refrigerant R134a flowing through rectangular microchannels with hydraulic diameters ranging from 100 µm to 200 µm are measured in small quality increments. The channels are fabricated on a copper substrate by electroforming copper onto a mask patterned by X-ray lithography and sealed by diffusion bonding. Subcooled liquid is electrically heated to the desired quality, followed by condensation in the test section. Downstream of the test section, another electric heater is used to heat the refrigerant to a superheated state. Energy balances on the preheaters and postheaters establish the refrigerant inlet and outlet states at the test section. Water at a high flow rate serves as the test-section coolant to ensure that the condensation side presents the governing thermal resistance. Heat transfer coefficients are measured for mass fluxes ranging from 200 kg/m2 s to 800 kg/m2 s for 0
DEWEY :	536
ISSN :	0022-1481
En ligne :	http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]

[article] Representative results for condensation measurements at hydraulic diameters ~100 microns [texte imprimé] / Akhil Agarwal, Auteur ; Srinivas Garimella, Auteur . - pp. [041010-1/12].
Physique
Langues : Anglais (eng)
in Journal of heat transfer > Vol. 132 N° 4 (n° spécial) (Avril 2010) . - pp. [041010-1/12]

Mots-clés :	Condensation Microchannels Measurement Heat transfer Pressure drop refrigerants
Index. décimale :	536 Chaleur. Thermodynamique
Résumé :	Condensation pressure drops and heat transfer coefficients for refrigerant R134a flowing through rectangular microchannels with hydraulic diameters ranging from 100 µm to 200 µm are measured in small quality increments. The channels are fabricated on a copper substrate by electroforming copper onto a mask patterned by X-ray lithography and sealed by diffusion bonding. Subcooled liquid is electrically heated to the desired quality, followed by condensation in the test section. Downstream of the test section, another electric heater is used to heat the refrigerant to a superheated state. Energy balances on the preheaters and postheaters establish the refrigerant inlet and outlet states at the test section. Water at a high flow rate serves as the test-section coolant to ensure that the condensation side presents the governing thermal resistance. Heat transfer coefficients are measured for mass fluxes ranging from 200 kg/m2 s to 800 kg/m2 s for 0
DEWEY :	536
ISSN :	0022-1481
En ligne :	http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&ONLINE=YES&smode= [...]