Fully Developed Opposing Mixed Convection Flow in the Inclined Channel Filled with a Hybrid Nanofluid.

Xiangcheng You,Shiyuan Li

doi:10.3390/nano11051107

Abstract

This paper studies the convective heat transfer of a hybrid nanofluid in the inclined channel, whose walls are both heated by the uniform heat flux. The governing ordinary differential equations are made nondimensional and solved analytically, in which explicit distributions of velocity, temperature and pressure are obtained. The effects of flow reversal, wall skin friction and Nusselt number with the hybrid nanofluid depend on the nanoparticle volume fractions and pressure parameters. The obtained results indicate that the nanoparticle volume fractions play a key role in delaying the occurrence of the flow reversal. The hybrid nanofluids hold more delayed range than conventional nanofluids, which is about 2.5 times that of nanofluids. The calculations have been compared with the base fluid, nanofluid and two kinds of hybrid models (type II and type III). The hybrid model of type III is useful and simplified in that it omits the nonlinear terms due to the interaction of different nanoparticle volumetric fractions, with the relative error less than 3%. More results are discussed in the results section below.

Highlights

College of Petroleum Engineering, China University of Petroleum-Beijing, Beijing 102249, China; Citation: You, X.; Li, S
Motivated and based on the literature discussed above, the main aim of this paper is to study the fully developed mixed convection flow in the inclined channel filled with a hybrid nanofluid, which employs homogeneous model proposed by Maïga et al [31]
The flow regime map of the base fluid (H2 O), nanofluid (Cu-H2 O,type I) and hybrid nanofluid (Cu-Al2 O3 -H2 O,type II and III) with φ1, φ2, the inflexion exists for each curve with corresponding to P2 = 0 and P1 = P1, c is shown in Figure 2 and Table 5

Summary

Introduction

College of Petroleum Engineering, China University of Petroleum-Beijing, Beijing 102249, China; Citation: You, X.; Li, S. This paper studies the convective heat transfer of a hybrid nanofluid in the inclined channel, whose walls are both heated by the uniform heat flux. The effects of flow reversal, wall skin friction and Nusselt number with the hybrid nanofluid depend on the nanoparticle volume fractions and pressure parameters. Lavine [7] presented an exact solution of fully developed, laminar flow between inclined parallel plates with a uniform wall heat flux boundary condition. Wang [8] studied numerically with fully developed opposing mixed convection in an inclined channel that had discrete heating on the bottom and was insulated on the top. Barletta et al [9] researched analytically the fully developed laminar mixed convection with viscous dissipation in an inclined channel with prescribed wall temperatures. Aydin et al [10] investigated MHD mixed convective heat transfer flow about an inclined plate

Objectives

Results

Conclusion