The Simulation of Turbulent Axisymmetric Impinging Jets Using RANS Methods (M.Engg Thesis)
- Karachi : NED University of Engineering and Technology Department of Mechanical Engineering, 2010
- XIV, 15-101 p. : ill
Includes Bibliographical References
Abstract:
In this dissertation the heat transfer augmentation on a flat surface via axisymmetric detached rib-rougheners is numerically investigated. Both single and multiple jet impingement with and without cross-flow interactions are investigated. Numerical simulations are done using Reynolds-averaged Navier-Stokes equations with the standard k-o Shear Stress Transport model in commercial CFD code ANSYS-CFX. The influence of jet Reynolds number (7000 ≤ Re, ≤ 78,000), blowing ratio (5.8 ≤ M ≤ 11.5), jet-outlet-to-target wall distance (2 ≤ H/D ≤ 6) and the rib clearance ratio (0.067 ≤ c /D ≤ 0.133) are examined. The experimental data relevant to present work is used to validate the results from numerical examinations of single jet impingement cases with and without detached ribs. Results show that the heat transfer on the target surface with the detached ribs increases in the single jet impingement system without cross-flow while in the single and multiple jets impingement with detached rib and cross-flow, peak Nusselt number increases at moderate cross-flow velocities.