EXPERIMENTAL AND NUMERICAL INVES EXPERIMENTAL AND NUMERICAL INVESTIGATION ON TURBULENT FLOW OF MWCNT-WATER NANOFLUID INSIDE VERTICAL COILED WIRE INSERTED TUBES

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Alireza RAHBARI Mohamad SHAHIDI Mohammad Reza ALIGOODARZ Mohammad Ali AKHAVAN-BEHABADI Saeed FOROUTANI

Abstract

In this paper, heat transfer and pressure drop behavior of MWCNT-water nanofluid turbulent flow inside vertical coiled wire inserted tubes with constant heat flux boundary condition were investigated experimentally and numerically. In the experimental section, plain and five wire coil inserted tubes were used as the test section's geometries. In the numerical section, the governing equations associated with the required boundary conditions were solved using finite  volume method based on the SIMPLE technique. The standard k-ε turbulence model was used in order to simulate the turbulence flow. The great agreement was found between the obtained experimental and numerical data with those predicted by the classical correlations for heat transfer and pressure drop in the plain tube. After validating the achieved data, the effects of various ranges of Reynolds number, particle weight concentration, wire diameter and coil pitch ratio on heat transfer coefficient and performance evaluation criterion (PEC) were declared. It was concluded that the Nusselt number has been increased up to 102% at the highest Reynolds number inside the coil wire WC3. Moreover,  the maximum enhanced PEC was seen for the wire coil with lowest coil pitch-to- tube inner diameter ratio (p/d) and highest wire-to-tube diameter ratio (e/d).

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How to Cite
RAHBARI, Alireza et al. EXPERIMENTAL AND NUMERICAL INVES EXPERIMENTAL AND NUMERICAL INVESTIGATION ON TURBULENT FLOW OF MWCNT-WATER NANOFLUID INSIDE VERTICAL COILED WIRE INSERTED TUBES. Thermal Science, [S.l.], mar. 2017. ISSN 2334-7163. Available at: <http://thermal-science.tech/journal/index.php/thsci/article/view/2226>. Date accessed: 18 oct. 2017. doi: https://doi.org/10.2298/TSCI151025069S.
Section
Articles
Received 2017-03-06
Accepted 2017-03-13
Published 2017-03-13

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