Dušan P. Sekulić, PhD, is the J.G. Morris Secat Aluminum Professor in the College of Engineering, Department of Mechanical and Aerospace Engineering, University of Kentucky. He has published extensively on heat transfer engineering, heat exchanger design, materials aspects of compact heat exchanger design, and related subjects. Ramesh K. Shah, PhD, has served as a Research Professor at the Rochester Institute of Technology and Senior Staff Research Scientist at Delphi Harrison Thermal System and General Motors. He has contributed widely to research publications on heat exchanger design and related subjects.