Experimental Measurements of Heat Transfer from a Cylinder to Turbulent Isothermal and Non-Isothermal Jets

This work is an experimental study of the effect of impinging distance on the heat transfer from a cylinder to turbulent isothermal and non-isothermal jets. The isothermal jet is discharged horizontally at the same temperature as the ambient air while the non-isothermal jet is discharged vertically upwards and vertically downwards at a temperature colder than the ambient air. Temperature measurements are made on a heated cylinder using an infrared (IR) camera at five equal impinging distances ranging from Z/d =4 to Z/d=20 and the distributions of the local Frossling numbers are determined. The overall decrease in the average Frossling numbers of the cylinder impinged by the isothermal jet and the cold jets was 25 % and 40% respectively. The peak values of average Frossling number for the isothermal and the cold jets occurred at Z/d=8 and Z/d=4 respectively. The Stagnation Frossling number and the normalized jet centerline velocity for the isothermal and the cold jets were found to be very close to each other at all impinging distances indicating that the effect of buoyancy is negligible in the range of jet temperatures and distances used in the experiment.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Mechanical Engineering

Department dc:contributor.department

Mechanical Engineering

Grantor dc:publisher

Virginia Tech

Year dc:date.issued

2016

Author dc:creator

• Balasubramanian, Karthik

Chair dc:contributor.committeechair

• Diller, Thomas E.

Committee members dc:contributor.committeemember

• Qiao, Rui
• Huxtable, Scott T.

• Isothermal jets
• Frossling number
• Froude number
• Heat transfer

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Dc Identifier Other

vt_gsexam:8186

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/71327