Numerical and Experimental Investigation of Heat Transfer Features in a Square Duct with Internal Ribs

Abstract

<jats:p>In this work, experimental investigation and numerical prediction were completed to study the heat transfer for disturbed flow in square passage heated from upper and lower aspect through the use of technology to heighten the heat transfer action by the use of different ribs shapes (semicircle, triangular and square) with the same surface area and height, distributed on the superior and inferior aspect of the heated channel. The experimental part included designing and manufacturing test apparatus and run the tests through operational parameters (Reynolds number 10460-40500) and heat flux (138-6888) W/m^2. While the design parameters included different ribs shapes (circular, triangular and square). Numerical investigation was done by using ANSYS FLUENT14.0 program, depending on Navier–Stokes equations, application of turbulence model k-ε and energy equation for the air were implemented for the same experimental conditions for all ribs type. In conclusion, the additions of ribs make noticeable enhance of the heat transfer compared to without ribs. Square ribs provide the best enhancement in heat transfer by (28.22-58.23) % compared to without ribs. Then comes the triangular and circular ribs that provide enhancement by (20.14-45.62) (10.87-28.13) % respectively. In addition to that, arrange the ribs in staggered pattern on the upper and lower aspect give the best heat transfer.</jats:p>

Experimental and numerical study of forced convictive heat transfer in a horizontal circular pipe with varying angles ribs

“…Al et al [37] investigated experimentally and numerically the influence of the pitch spacing of the rib in a turbulent ribbed tube on the fluid flow rate and coefficient of the heat transfer. Golam [38] examined the rib forms effect on the characteristics of convective heat transfer in a square passage, and his findings were supported by experimental evidence. Round, triangular, and square ribs were among the rib shapes that were employed.…”

C Investigation of Heat Transfer Coefficient Augmentation in Divergent Rectangular Duct for Two Phases Flow (Air-Water)

“…Therefore, there are several researches with various techniques have been presented. The re-configuration of geometry is one of the techniques to increase the efficiency of heat exchangers and save costs and energy [Abdulrazzaq Guptaa, et al (2013);Togun, (2016); Al-Jibory (2018); Golam (2018); and Guptaa, et al (2018]. The usage of the rough elements which include grooves, wires or welded ribs on the surface, or turbulence promoters, is a popular approach to enhance the heat transfer [Promvonge, et al (2012); Piriyarungrod, et al (2015); Bhuiya, et al (2016); and Zhang, et al (2016)].…”