| |
|
S10 Fluidodināmica de Escoamento Multifįsico |
| |
|
Title:
|
CONDENSATION IN MICROCHANNELS WITH POROUS BOUNDARY: ANALYTICAL INVESTIGATION ON HEAT TRANSFER AND MENISCUS SHAPE
|
| |
|
Summary :
|
|
IN TWO-PHASE MINIATURE AND MICROCHANNEL FLOWS, THE MENISCUS SHAPE MUST BE CONSIDERED DUE TO EFFECTS THAT ARE AFFECTED BY CONDENSATION AND/OR EVAPORATION AND COUPLED WITH THE TRANSPORT PHENOMENA IN THE THIN FILM ON THE MICROCHANNEL WALL. THIS INVESTIGATION PRESENTS AN ANALYTICAL MODEL FOR MICROCHANNEL CONDENSERS WITH A POROUS BOUNDARY, WHERE THE FLUID IS PUMPED BY CAPILLARY FORCES. METHANOL WAS SELECTED AS THE WORKING FLUID. VERY LOW LIQUID REYNOLDS NUMBERS WERE OBTAINED (RE~6), BUT VERY HIGH NUSSELT NUMBERS (NU~90) COULD BE FOUND DUE TO THE CHANNEL SIZE (1.5 MM) AND THE PRESENCE OF THE POROUS BOUNDARY. THE MENISCUS CALCULATION PROVIDED CONSISTENT RESULTS FOR THE VAPOR INTERFACE TEMPERATURE AND PRESSURE, AS WELL AS THE MENISCUS CURVATURE. THE OBTAINED RESULTS SHOW THAT MICROCHANNEL CONDENSERS WITH A POROUS BOUNDARY CAN BE USED FOR HEAT DISSIPATION WITH REDUCED HEAT TRANSFER AREA AND VERY HIGH HEAT DISSIPATION CAPABILITIES.
KEYWORDS: MICROCHANNELS, CONDENSATION, MENISCUS |
| |
|
Author :
|
Ochterbeck, Jay M.
Riehl, Roger R.
Seleghim Jr., Paulo 0
|
| |
|
Paper View :
|
|
COBEM99
| Organizing Committee | Keynotes
| Technical
Sessions | Author
| Symposia and special sessions
| Referees |
Work
Titles | Venue
|
