Sujoy Kumar Saha is a Professor in the Mechanical Engineering Department of the Indian Institute of Engineering Science and Technology, Shibpur Howrah, West Bengal, India. Madhu Sruthi Emani is a doctoral candidate working under the supervision of Dr. Sujoy Kumar Saha, at Indian Institute of Engineering Science and Technology, Shibpur, Howrah, India. She is working in the area of Heat Transfer Enhancement for her PhD thesis. Anand Kumar Bharti is a doctoral candidate working under the supervision of Dr. Sujoy Kumar Saha, at Indian Institute of Engineering Science and Technology, Shibpur, Howrah, India. He is working in the area of Heat Transfer Enhancement for his PhD thesis. Hrishiraj Ranjan is a doctoral candidate working under the supervision of Dr. Sujoy Kumar Saha, at Indian Institute of Engineering Science and Technology, Shibpur, Howrah, India. He is working in the area of Heat TransferEnhancement for his PhD thesis.

• Chapter 1. Introduction.- Chapter 2. Twisted-Tape Insert.- Chapter 3. Displaced Enhancement Devices and Wire Coil Inserts.- Chapter 4. Swirl Generators, Extended Surface Insert and Tangential Injection Devices.- Chapter 5. Numerical Simulation of Integral Roughness, Laminar Flow in Tubes with Roughness.- Chapter 6. 2D Roughness, 3D roughness and Roughness Applications.- Chapter 7. Compound Techniques.- Chapter 8. Conclusions.