In this book, applications of nanoflduid in various geometries have been presented. Most of engineering problems, especially some heat transfer equations are nonlinear, therefore some of them are solved using numerical solution and some are solved using the different analytic method. This research was supported by the National Sciences Foundation of China (NSFC) (No. U1610109), Yingcai Project of CUMT (YC2017001), PAPD and UOW Vice-Chancellor's Postdoctoral Research Fellowship.