Abstract
Heat transfer enhancement in channel flow is investigated in the present study by using corrugated duct in lieu of smooth duct. In this regard, periodic different cavities are applied on the duct walls using the same aspect ratios. The values of the Reynolds numbers are in the range of 10,000 ≤ Re ≤ 20,000. The effects of the alumina-water nanofluid flow on the corrugated ducts are alternatively investigated by using the constant nanoparticle size for further improvement of the thermal characteristics. Computations are performed by means of finite volume approach on three different corrugated shapes. The effects of various parameters on the heat and fluid flow are also studied. The obtained results have revealed that the application of corrugated duct increases the rate of turbulent intensity on the central axis of the duct. In addition, it is found that the rate of heat transfer changes as a result of corrugated shape and Reynolds number. Furthermore, it is demonstrated that the application of the alumina-water flow in such ducts enhances the rate of the heat transfer and thermal performance when compared with the water flow. It is hoped that the obtained results will arouse interest towards thermal design.  
Highlights
Nanotechnology would be noted as the most important locomotive for the major industrial revolution of the present time
Santra et al [5] showed that the heat transfer owing to laminar flow of copper-water nanofluid through two-dimensional channel with constant temperature walls and they conducted that the rate of heat transfer enhancement with the rising in flow Reynolds number, Re, as well as the increase in solid volume fraction
In the present study, heat transfer enhancement and flow characteristics of alumina-water nanofluid through corrugated channel with different geometric shapes are numerically investigated for a Reynolds number range of 10,000-20,000 and nanoparticle volume fraction is taken as 0.5%
Summary
Nanotechnology would be noted as the most important locomotive for the major industrial revolution of the present time. Santra et al [5] showed that the heat transfer owing to laminar flow of copper-water nanofluid through two-dimensional channel with constant temperature walls and they conducted that the rate of heat transfer enhancement with the rising in flow Reynolds number, Re, as well as the increase in solid volume fraction. Manca et al [9] studied a numerical analysis on forced convection using Al2O3 nanoparticles in the water They are considered the particle size is set equal to 38 nm, nanoparticle volume fractions from 0% to 4% and the flow regime is turbulent and Reynolds numbers are in the range 20,000-60,000. Numerical method is employed for flow in channels having different corrugated shapes such as circular, triangular, and trapezoidal under constant wall temperatures with nanoparticle volume fraction 0.5% and Reynolds number ranging from 10,000 to 20,000
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