Reason-A Technical Journal (Formerly Reason-A Technical Magazine)

Suman Das ¹, Bikash Banerjee ¹, Nripen Mondal ¹

Affiliations
1 Department of Mechanical Engineering, Jalpaiguri Government Engineering College, Jalpaiguri- 735102, IN

Abstract

Grinding is a mechanical metal removal process used in manufacturing industries. In this process, the material is removed from a work-piece material by an abrasive wheel. This process gives better surface finish and close tolerance. Grinding process removes material by shearing, ploughing, rubbing and brittle fracture with high- speed and a high input of energy per unit volume. The coolant or grinding fluid is used to reduce the temperature in grinding zone and also it is used as a lubricant into grinding zone. In present work, a five port multi-nozzle system has been developed and performance of this nozzle has been compared with flood type copper cooling nozzle under different environmental conditions. Two parameters (chip characteristics, surface roughness) of grinding are considered to find the suitable process for grinding of a mild steel specimen. From this experimental investigation, it can be observed that in wet condition, five port multi-nozzle system provides better surface finish as well as it is more economical.

Keywords

Five Port Multi-nozzle, Surface Roughness, Depth of Cut, Grinding, Chip, Dry Test.

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MD Shahbaz ¹, Md Naim Hossain ¹, Nripen Mondal ¹

Affiliations
1 Department of Mechanical Engineering, Jalpaiguri Govt. Engineering College, Jalpaiguri- 735102, India, IN

Abstract

The present paper represents a numerical analysis of "ow boiling with volume of "uid (VOF) approach. The analysis has been carried out with the commercial CFD solver ANSYS Fluent 14.5. The said work is focused to demonstrate the suitability of the existing models in ANSYS Fluent to simulate precisely the boiling phenomenon when the "uid is in motion inside heated pipe. The proposed boiling dynamics is carried out with the available VOF approach inANSYS Fluent. The boiling process is handled with the evaporation and condensation model. The said work is validated with an existing experimental work and the validation shows good agreement. There is some error in this validation. That is because boiling phenomenon is highly turbulent and transient phenomenon. Boiling process deviates from the expected behaviour with little perturbation of heat transfer, surface temperature and "ow !eld etc.Another reason of error is that the boiling phenomenon is a highly localized process. The same type of "ow !eld may not present if authors replicate the same "ow boiling process. Overall, the proposed work shows satisfactory match with the said experimental work. This points out that one can use VOF model with evaporation-condensation boiling phenomenon for further hydro-geometric analyses of "ow boiling.

Keywords

Flow Boiling, VOF Approach, Evaporation-condensation, Pipe Flow, Boiling.

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