CFD Analysis of Temperature Distributions in a Slurry Bubble Column with Direct Contact Heat Transfer

Attempts have been made to study an ice slurry generation system where two immiscible liquids, water and a coolant, are used to produce ice slurry by direct contact heat transfer. A mathematical model has been developed to evaluate the heat transfer phenomena between the coolant drops and the water in the ice slurry generation system. In this process, all the important variables that affect the direct contact heat transfer between these two fluids were incorporated into the simulation model to evaluate thermal performance of the system. Experiments were performed on an ice slurry generator using water and an immiscible liquid coolant, Fluroinert FC-84. The coolant at about −10°C to −15°C was delivered to the top of the ice slurry generator containing water and collected from the bottom for recirculation. The measured temperature profiles of water in the ice slurry generator for different coolant flow rates (8 lit/min to 12 lit/min) showed a good agreement with those temperature profiles obtained from the simulation model. These results validated the simulation model developed for the ice slurry generator. The analysis showed that during sensible cooling, the estimated heat transfer coefficients between water and the coolant were in the range of 3.0 to 6.5 kW/m2 for coolant flow rates varying from 8 lit/min to 12 lit/min. Higher coolant flow rates also enhanced the ice formation process due to the increased heat transfer rate. In addition, it was also observed that the ice production increased significantly when the nozzle was placed at the bottom of the ice slurry generator.

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Direct contact heat transfer with change of phase

International Journal of Heat and Mass Transfer ◽

10.1016/0017-9310(70)90161-4 ◽

1970 ◽

Vol 13 (6) ◽

pp. 945-956 ◽

Cited By ~ 9

Author(s):

M Bentwich ◽

U Landau ◽

S Sideman

Keyword(s):

Heat Transfer ◽

Direct Contact ◽

Contact Heat ◽

Contact Heat Transfer

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Complexity evolution quantification of bubble pattern in a gas-liquid mixing system for direct-contact heat transfer

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2018.04.058 ◽

2018 ◽

Vol 138 ◽

pp. 832-839 ◽

Cited By ~ 8

Author(s):

Qingtai Xiao ◽

Kai Yang ◽

Manman Wu ◽

Jianxin Pan ◽

Jianxin Xu ◽

...

Keyword(s):

Heat Transfer ◽

Direct Contact ◽

Contact Heat ◽

Contact Heat Transfer ◽

Liquid Mixing

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Latent Thermal Storage Unit Using Form-Stable High Density Polyethylene; Part I: Performance of the Storage Unit

Journal of Solar Energy Engineering ◽

10.1115/1.3268107 ◽

1986 ◽

Vol 108 (4) ◽

pp. 282-289 ◽

Cited By ~ 20

Author(s):

M. Kamimoto ◽

Y. Abe ◽

S. Sawata ◽

T. Tani ◽

T. Ozawa

Keyword(s):

Heat Transfer ◽

High Density Polyethylene ◽

Direct Contact ◽

Thermal Storage ◽

High Density ◽

Heat Transfer Fluid ◽

Contact Heat ◽

Storage Unit ◽

Contact Heat Transfer ◽

Solar Thermal Applications

A latent thermal storage unit of 30 kWh using form-stable high density polyethylene (HDPE) rods has been developed mainly for solar thermal applications, and heat transfer experiments have been carried out. A direct contact heat transfer technique between HDPE rods and ethylene glycol (EG: a heat transfer fluid) is adopted. Charge and discharge characteristics have been obtained for various thermal input/output and different initial temperature profiles in the storage unit. The direct contact heat transfer and a formation of a clear thermocline provide a good performance for all the cases. Discussions are given of thermal efficiency, storage density, and thermal insulation.

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