Iranian Nanotechnology Society International Journal of Nanoscience and Nanotechnology 1735-7004 10 3 2014 09 01 Calculation of Heat Transfer Coefficient of MWCNT-TiO2 Nanofluid in Plate Heat Exchanger 153 162 9092 EN M. A. Safi Transport Phenomena and Nanotechnology Laboratory, Department of Chemical Engineering, College of Eng., University of Tehran, Tehran, I. R. Iran A. Ghozatloo Transport Phenomena and Nanotechnology Laboratory, Department of Chemical Engineering, College of Eng., University of Tehran, Tehran, I. R. Iran A. A. Hamidi Department of Chemical Engineering, College of Eng., University of Tehran, Tehran, I. R. Iran M. Shariaty-Niassar Transport Phenomena and Nanotechnology Laboratory, Department of Chemical Engineering, College of Eng., University of Tehran, Tehran, I. R. Iran Journal Article 2013 12 30 The objective of the present study is the synthesis of MWCNT-TiO2 hybrid nanostructures by solvothermal synthesis method with TiCl4 as precursor. The heat transfer enhancement due to the use of MWCNT-TiO2 nanofluid was investigated. As-prepared hybrid materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that MWCNTs were uniformly decorated with anatase nanocrystals. The heat transfer performance of the plate heat exchanger (PHE) was investigated using MWCNT-TiO2 nanofluid at various volume flow rates, a wide range of concentrations and inlet temperatures. The performance is discussed in terms of heat transfer coefficient ratio. The results showed that the heat transfer coefficient of the nanofluid was more than that of the base fluid (Distilled Water). The heat transfer coefficient was enhanced with increasing the nanofluid concentration from 0.02 to 0.08 wt.% and volume flow rate from 2 to 3.5 LPM. Conversely, the heat transfer coefficient decreased with increasing the nanofluid inlet temperature from 36 to 60oC. https://www.ijnnonline.net/article_9092_efe34c4e2190e97d1adc625902822b13.pdf