Hybrid experimental/modelling methodology for identifying the convective heat transfer coefficient in cryogenic assisted machining

•Investigation of heat transfer coefficient between LN2 and titanium alloy.•Influence of LN2 projection parameters on temperature distribution in the workpiece.•Determination of h (W/m2K) with temperature measurement and CFD simulations.•Results highly depends on LN2 projection parameters (pressure...

Full description

Saved in:
Bibliographic Details
Published in:Applied thermal engineering 2018-01, Vol.128, p.500-507
Main Authors: Lequien, P., Poulachon, G., Outeiro, J.C., Rech, J.
Format: Article
Language:English
Subjects:
Chemical and Process Engineering
Coefficient
Convective heat transfer
Cryogenic machining
Engineering Sciences
Heat transfer
Heat transfer coefficients
Hot cutting
Liquid nitrogen
Machining
Mathematical models
Mechanics
Metal cutting
Stress concentration
Studies
Thermics
Thermocouples
Ti6Al4V
Tool life
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Investigation of heat transfer coefficient between LN2 and titanium alloy.•Influence of LN2 projection parameters on temperature distribution in the workpiece.•Determination of h (W/m2K) with temperature measurement and CFD simulations.•Results highly depends on LN2 projection parameters (pressure and nozzle diameter).•Mathematical development for predicting convective heat transfer coefficient. Cryogenic assisted machining has become a very popular method in the metal cutting industry, as it enables the cooling of a cutting zone for improving surface integrity or/and tool life without contaminating the machined part. However, the thermal interaction between liquid nitrogen (LN2) and a hot cutting zone remains unclear. The main objective of this work is to analyse the thermal phenomena occurring at the LN2 jet/workpiece interface. The nitrogen liquid/gas phase proportion has a significant influence on the heat transfer. To determine the influence of LN2 jet parameters on the convective heat transfer coefficient, a model based on the projection of an LN2 jet on a workpiece instrumented with thermocouples is proposed. The most influential parameters of the thermal distribution and heat transfer coefficient are LN2 pressure, nozzle diameter, projection angle and the distance between the nozzle and the workpiece surface.
ISSN:1359-4311
1873-5606
DOI:10.1016/j.applthermaleng.2017.09.054