Experimental Investigation of the Wake behind the Bluff Body with Heating

Narendar Padmanaban

Diplomová práce

Abstract:

Wake behind heated cylinder have been experimentally investigated at low Reynolds numbers. The electrically heated cylinder is mounted in a horizontal circulation water channel facility. The dimensionless parameter Reynolds number is varied to examine flow behavior by forced convection experimental condition. Particle Image Velocimetry (PIV) and Planar-Laser Induced Fluorescence methods (PLIF/LIF) has been used for flow visualization and analysis of the flow structures. The complete vortex-shedding sequence has been recorded using a high speed camera. The dynamical characteristics of the vertical structures - their size, shape and phase are reported. On heating, the changes in the organized structures with respect to shape, size, and their movement are readily perceived from the instantaneous camera images before they reduce to a steady plume.

Abstract:

Wake behind heated cylinder have been experimentally investigated at low Reynolds numbers. The electrically heated cylinder is mounted in a horizontal circulation water channel facility. The dimensionless parameter Reynolds number is varied to examine flow behavior by forced convection experimental condition. Particle Image Velocimetry (PIV) and Planar-Laser Induced Fluorescence methods (PLIF/LIF) has been used for flow visualization and analysis of the flow structures. The complete vortex-shedding sequence has been recorded using a high speed camera. The dynamical characteristics of the vertical structures - their size, shape and phase are reported. On heating, the changes in the organized structures with respect to shape, size, and their movement are readily perceived from the instantaneous camera images before they reduce to a steady plume.

Keywords

Wake, Heated cylinder, Reynolds number, PIV, LIF

Jazyk práce: angličtina

Datum vytvoření / odevzdání či podání práce: 3. 5. 2019

Obhajoba závěrečné práce

• Vedoucí: Ing. Petra Dančová, Ph.D.

Technická univerzita v Liberci

Fakulta strojní

Magisterský studijní program / obor:
Mechanical Engineering / Machines and Equipment Design