Heat Transfer Enhancement by Coupling of Carbon Nanotubes and SiO2 Nanofluids: A Numerical Approach

• Published in: Processes Vol. 7; no. 12; p. 937
• Main Authors: Saba, Fitnat, Noor, Saima, Ahmed, Naveed, Khan, Umar, Mohyud-Din, Syed Tauseef, Bano, Zarqa, M. Sherif, El-Sayed, Khan, Ilyas
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.12.2019
• Subjects: Algorithms; Boundary conditions; Carbon; Carbon nanotubes; Chemical engineering; Coefficient of friction; Conductivity; Cooling; Differential equations; Fluid flow; Heat conductivity; Heat transfer; Mathematical models; Nanofluids; Nanomaterials; Nanoparticles; Nanotubes; Ordinary differential equations; Runge-Kutta method; Silicon dioxide; Skin friction; Thermal conductivity; Three dimensional flow; Velocity distribution; Wavelet analysis
• ISSN: 2227-9717; 2227-9717
• DOI: 10.3390/pr7120937

This article comprises the study of three-dimensional squeezing flow of (CNT-SiO2/H2O) hybrid nanofluid. The flow is confined inside a rotating channel whose lower wall is stretchable as well as permeable. Heat transfer with viscous dissipation is a main subject of interest. We have analyzed mathematically the benefits of hybridizing SiO 2 -based nanofluid with carbon nanotubes ( CNTs ) nanoparticles. To describe the effective thermal conductivity of the CNTs -based nanofluid, a renovated Hamilton–Crosser model (RHCM) has been employed. This model is an extension of Hamilton and Crosser’s model because it also incorporates the effect of the interfacial layer. For the present flow scenario, the governing equations (after the implementation of similarity transformations) results in a set of ordinary differential equations (ODEs). We have solved that system of ODEs, coupled with suitable boundary conditions (BCs), by implementing a newly proposed modified Hermite wavelet method (MHWM). The credibility of the proposed algorithm has been ensured by comparing the procured results with the result obtained by the Runge-Kutta-Fehlberg solution. Moreover, graphical assistance has also been provided to inspect the significance of various embedded parameters on the temperature and velocity profile. The expression for the local Nusselt number and the skin friction coefficient were also derived, and their influential behavior has been briefly discussed.