Vikas Patnaik | Ingersoll Rand University (original) (raw)
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University of Illinois at Urbana-Champaign
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Papers by Vikas Patnaik
International Journal of Refrigeration, 2015
Microchannel Condensor Multi-slab a b s t r a c t This paper presents the development of a finite... more Microchannel Condensor Multi-slab a b s t r a c t This paper presents the development of a finite-volume-based numerical condenser model that considers important factors such as non-uniform air temperature and velocity at the front, fin conduction, refrigerant-side maldistribution caused by pressure balance between tubes, and air-side distribution for multislabs. Air-side and refrigerant-side microscale heat transfer and pressure drop correlations are carefully compared. The model results match well with lab test results for one-slab and two-slab microchannel heat exchangers on heat transfer and pressure drop. Several simulations are conducted to determine the impact of return air temperature, tube wall temperature, and non-uniform refrigerant flow rate. In addition, optimization results are analyzed by changing the number of flat tubes in each pass for both types of heat exchangers.
International Journal of Heat and Fluid Flow, 1996
The mass transfer rates into wavy falling films are larger than those predicted by smooth-film th... more The mass transfer rates into wavy falling films are larger than those predicted by smooth-film theory. Inertial, roll waves in the falling film flowing over a vertical tube are responsible for the largest enhancement. Transient, two-dimensional (2-D) governing equations were formulated for simultaneous heat and mass transfer in the film, with roll wave hydrodynamics as input. The equations, coupled nonlinearly
International Journal of Heat and Fluid Flow, 1996
... element methods, have been obtained to study wave development from initial perturba-tions on ... more ... element methods, have been obtained to study wave development from initial perturba-tions on the smooth film (Bach and Villadsen 1984; Kheshgi ... Acknowledgments The authors would like to thank Mr. William Ryan of the Gas Research Institute for funding part of this work ...
International Journal of Refrigeration, 2015
Microchannel Condensor Multi-slab a b s t r a c t This paper presents the development of a finite... more Microchannel Condensor Multi-slab a b s t r a c t This paper presents the development of a finite-volume-based numerical condenser model that considers important factors such as non-uniform air temperature and velocity at the front, fin conduction, refrigerant-side maldistribution caused by pressure balance between tubes, and air-side distribution for multislabs. Air-side and refrigerant-side microscale heat transfer and pressure drop correlations are carefully compared. The model results match well with lab test results for one-slab and two-slab microchannel heat exchangers on heat transfer and pressure drop. Several simulations are conducted to determine the impact of return air temperature, tube wall temperature, and non-uniform refrigerant flow rate. In addition, optimization results are analyzed by changing the number of flat tubes in each pass for both types of heat exchangers.
International Journal of Heat and Fluid Flow, 1996
The mass transfer rates into wavy falling films are larger than those predicted by smooth-film th... more The mass transfer rates into wavy falling films are larger than those predicted by smooth-film theory. Inertial, roll waves in the falling film flowing over a vertical tube are responsible for the largest enhancement. Transient, two-dimensional (2-D) governing equations were formulated for simultaneous heat and mass transfer in the film, with roll wave hydrodynamics as input. The equations, coupled nonlinearly
International Journal of Heat and Fluid Flow, 1996
... element methods, have been obtained to study wave development from initial perturba-tions on ... more ... element methods, have been obtained to study wave development from initial perturba-tions on the smooth film (Bach and Villadsen 1984; Kheshgi ... Acknowledgments The authors would like to thank Mr. William Ryan of the Gas Research Institute for funding part of this work ...