Two-phase nanofluid over rotating disk with exponential variable thickness. Issue 10 (7th October 2019)

• Record Type: Journal Article
• Authors: Liu, Chunyan; Ding, Yiming; Zheng, Liancun; Lin, Ping; Li, Ruilin
• Is Part Of: International journal of numerical methods for heat & fluid flow. Volume 29:Issue 10(2019)
• Page Start: 3781
• Page End: 3794
• Publication Date: 2019-10-07
• Subjects: Porous media -- Generalized von Karman transformation -- Variable thickness rotating disk -- Nanofluid; Heat -- Transmission -- Mathematics -- Periodicals; Fluid dynamics -- Mathematics -- Periodicals; 536.2
• DOI: 10.1108/HFF-07-2018-0347
• Languages: English
• ISSNs: 0961-5539

Abstract

Abstract : Purpose: The purpose of this paper is to investigate the effect of nanofluid over rotating disk with the exponential variable thicknessZ = c e − b R R 0 ( c > 0, b > 0) and to analyze Brownian motion and thermophoresis of Buongiorno model on the disk embedded in nanofluid-saturated porous media. Design/methodology/approach: Using the generalized von Karman transformation, the boundary layer governing equations are transformed into semi-similar forms solved by bvp4c in MATLAB. Findings: The effects of the thickness parameter a, the shape parameter b, the Brownian motion parameter Nb and thermophoresis parameter Nt on flow, heat and mass transfer are analyzed. With the increase of thickness parameter a, the radial velocity first decreases and then increases, showing the opposite trend on the two sides of the peak value. Moreover, temperature and concentration rise as the Brownian motion parameter Nb becomes larger. Originality/value: To the best of the authors' knowledge, this is the first work that has been done on rotating disk with exponential variable thickness in nanofluid. The impact of the two slip effects, namely, Brownian motion and thermophoresis, on the nanofluid boundary layer flow, heat and mass transfer because of rotating disk with exponential variable thicknessZ = c e − b R R 0 ( c > 0, b > 0) has been addressed in this study.