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Capability of MARS-KS on Predicting Wall Condensation in the Presence of Non-Condensable Gases
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In order to improve the convective boiling heat transfer of R410A, the micro-fin tube was used to enhance heat transfer. The experimental studies on the horizontal micro-fin tube and smooth tube were conducted by using R410A as the working fluid. Several factors affecting heat transfer coefficients were analyzed, such as mass flux, heat flux, and quality. The circumferential wall temperature variation of the testing tubes with R410A as the working fluid was observed and analyzed. The heat transfer enhancement factor of the micro-fin tube against the smooth tube was about 1.6 to 2.2. The preliminary experiment data were useful for further research.
A simple dimensionless correlation for predicting heat-transfer coefficients during film condensation inside pipes is presented. It has been verified by comparison with a wide variety of experimental data. These include fluids water, R-11, R-12, R-22, R-113, methanol, ethanol, benzene, toluene, and trichloroethylene condensing in horizontal, vertical, and inclined pipes of diameters ranging from 7 to 40mm. One data set for condensation inside an annulus has also been analyzed. The range of parameters covered includes reduced pressures from 0.002 to 0.44, saturation temperatures from 21 to 310°C, vapor velocities from 3 to 300m/s, vapor qualities from 0 to 100%, mass flux 39000-758 000kg/m2 h, heat flux from 158 to 1 893000W/m2, all liquid Reynolds numbers from 100 to 63 000, and liquid Prandtl numbers from 1 to 13. The mean deviation for the 474 data points analyzed was found to be 15.4%.
The ATHENA (Advanced Thermal Hydraulic Energy Network Analyzer) code has been developed to perform transient simulation of the thermal hydraulic systems which may be found in fusion reactors, space reactors, and other advanced systems. A generic modeling approach is utilized which permits as much of a particular system to be modeled as necessary. Control system and secondary system components are included to permit modeling of a complete facility. Several working fluids are available to be used in one or more interacting loops. Different loops may have different fluids with thermal connections between loops. The modeling theory and associated numerical schemes are documented in Volume I in order to acquaint the user with the modeling base and thus aid effective use of the code. The second volume contains detailed instructions for input data preparation.
Final report: COPAIN program
- P Bazin
- P Castelli
Bazin P., Castelli, P., Final report: COPAIN program,
Technical report, CONT-DABASCO (99) P010, 1999.