Arun Kumar Tiwari is an Associate Professor, Department of Mechanical Engineering, I.E.T, Lucknow. He also serves as the Head of Department, Mechanical Engineering, IET, Lucknow. He also serves at other positions such as: Chairman, BOS, Mechanical Engineering, I.E.T, Lucknow, Officer In-charge, Training & Placement officer, I.E.T, Lucknow. Dr. Arun has completed his Ph.D. from IIT (BHU), Varanasi . He completed his M. Tech from IIT-Roorkee . He has graduated in Mechanical Engineering from B.I.E.T Jhansi. He had supervised 04 PhD theses (with 05 in progress), and about 12, M. Tech thesis in his areas of interest. He is the author and co-author of more than 75 research papers in various reputed International journals (SCI=45;Scopus=30) and 35 international conference proceedings, and 4 book chapters. He has 2700 citations with an h-index of 24. Two of his papers “Numerical investigation of heat transfer and fluid flow in plate heat exchanger using nanofluids” and “Performance comparison of the plate heat exchanger using different nanofluids” have been ranked 2nd and 5th on the science direct top 25 most downloaded papers of the journal. Moreover another paper is consecutively ranked thrice,5th, 8th and 17th| on the science direct top 25 most downloaded papers of the journal. He had reviewed more than 100 manuscripts of various reputed International journals. His 07 research papers have more than 100 citations (Google scholar data). He works in the field of Heat Transfer (Heat Transfer, Cooling and Heating), Nanofluids and heat exchangers, Renewable Energy, Energy and Exergy Analysis, Solar Energy (Solar Collectors, Energy Efficiency, Efficiency Improvement).