Date of Award
2015
Document Type
Thesis
Degree Name
Master of Science in Aerospace and Systems Engineering (MSASE)
Department
Mechanical and Aerospace Engineering
Committee Chair
Phillip M. Ligrani
Committee Member
Sarma Rani
Committee Member
George J. Nelson
Subject(s)
Heat--Transmission., Nusselt number.
Abstract
The present investigation involves testing the addition of special surface roughness patterns to an impingement surface to improve the effectiveness of impingement cooling. This investigation utilizes various sizes, distributions, shapes, and patterns of surface roughness elements for impingement cooling augmentation. Surface roughness shapes include rectangles, triangles, and cylinders. Combinations of small roughness and large pins are considered. Tests are performed at Reynolds numbers of 900, 1500, 5000, and 11000. In general, plates with small roughness alone perform better than plates with a combination of small roughness and large pins at Reynolds numbers of 900 and 1500. Combinations of small rectangle roughness and large pins give better heat transfer results than the small rectangle roughness alone at Reynolds numbers of 5000 and 11000, while the triangle roughness and cylinder roughness configurations with large pins show little improvement over small roughness alone. All triangle roughness configurations perform better than the rectangle configurations.
Recommended Citation
Buzzard, Warren, "Influences of target surface roughness on impingement jet array heat transfer" (2015). Theses. 146.
https://louis.uah.edu/uah-theses/146