Sadık Kakaç

Prof. of Mechanical Engineering

TOBB University of Economics and Technology, Ankara, Turkey

Heat Transafer Enhancement in Laminar Convective Heat Transfer with Nanofluids

 Abstract:

Nanofluids are promising heat transfer fluids due to their high thermal conductivity. In order to utilize nanofluids in practical applications, accurate prediction of forced convection heat transfer of nanofluids is necessary. In the first part of the lecture, the application of some classical correlations of forced convection heat transfer developed for the flow of pure fluids to the case of nanofluids by the use of nanofluid thermophysical properties is considered. The results are compared with experimental data available in the literature, and it is shown that this approach underestimates the heat transfer enhancement. Furthermore, predictions of a recent correlation based on a thermal dispersion model are also examined, and good agreement with the experimental data is observed. The thermal dispersion model is further investigated through a single-phase, temperature-dependent thermal conductivity approach. Numerical analysis of hydrodynamically fully developed laminar forced convection of Al2O3(20 nm)/water nanofluid inside a circular tube under constant wall temperature and constant wall heat flux boundary conditions has been carried out. Results of the numerical solution are compared with the experimental data available in the literature. The results show that the single-phase assumption with temperature-dependent thermal conductivity and thermal dispersion is an accurate way of heat transfer enhancement analysis of nanofluids in convective heat transfer.

Biography:

Dr. Sadik Kakaç is a Emeritus professor of Mechanical Engineering from the University of Miami in Florida. He served as a Chairman of the department from 1990 to 1998.In 1955, he received the Dipl.-Ing. in Mechanical Engineering from the Technical University of Istanbul and then received his M.S. in Mechanical Engineering in 1959 and his M.S. in Nuclear Engineering in 1960, both from the Massachusetts Institute of Technology. In 1965, he received his Ph.D. in the field of heat transfer from the Victoria University of Manchester, UK. He was elected as a member of the Turkish Scientific and Technical Research Council in 1972 and became General Secretary of the Turkish Atomic Energy Commission in 1978, representing Turkey in a number of scientific endeavors abroad. He was the recipient of the Alexander von Humboldt Senior Distinguished U.S. Scientist Award in 1989, the Science Award of the Association of Turkish-American Scientists in 1994, the ASME (American Society of Mechanical Engineers) Heat Transfer Memorial Award in 1997, the ICHMT Fellowship Award in 1997, and the Distinguished Service Award from the Middle East Technical University in 1998 and from the Turkish Scientific and Technical Research Council in 2000. He is a fellow of the ASME, the member of the Turkish Academy of sciences and foreign member of the Bashkortostan Academy of Sciences of Russian Federation He is an honorary professor at the Shanghai Institute of Electrical Power , and of Xi’an Jiaotong University in China. He received the Doctor Honoris Causa from the University Ovidius, Romania in 1998; from the University of Reims, France in 1999 and from the Odessa State Academy of Refrigeration in 2008. Dr. Dr. Kakaç has focused his research efforts on steady-state and transient forced convection in single-phase and on two-phase flow instabilities in flow boiling, microscale/nanofluid heat transfer and fuel-cells. He is the author or co-author of six heat transfer text books and more than 200 research papers, as well as fifteen edited volumes in the field of thermal sciences, including the Handbook of Single-Phase Convective Heat Transfer. Dr. Kakaç is in the editorial board of the various International Journals and he is a member of the Scientific Council and the Executive Committee of the International Center for Heat and Mass Transfer. He is now Prof. at TOBB University of Economics and Technology, Ankara.