This book is mainly devoted to help graduate students who are not familiar with the designing and constructing test rig to conduct their experimental projects, especially for the ¿Fluid Flow¿ projects. It is also useful for postgraduate students during their higher studies to develop their ability to design and build the test rig for the MSc and PhD work. Moreover, it is beneficial for working engineers in the Research and Development Centers to enhance their scientific capability and gives them the proper procedure to design and construct the relevant test rigs. In order to cover most types of experimental test rigs used in for the fluid flow research works, this book is divided into three chapters: Chapter one is about ¿Drag Coefficient, Flow Control and Aerodynamic Characteristics¿ topic presented in terms of three cases, chapter two is about ¿Surface Roughness¿, chapter three is about ¿Nano Fluids¿, chapter four is about ¿Porous Mediä, chapter five is about ¿Entropy Generation¿, chapter six is about ¿Packed Bed Mediä, chapter seven is about ¿Concentric Annuli¿, chapter eight is about ¿Finned Tube Bundle¿.