Thermal Performance of a Heated Pipe in the Presence of a Metal Foam and Twisted Tape Inserts

Abstract

To meet the demand for more efficient ways of cooling and heating, new designs and further development of heat exchangers is essential in industry. The present study focuses on the thermal performance of a circular pipe with two inserts. The first insert consists of a porous medium having a porosity of 0.91, and the second one consists of a single twist solid insert. Different ranges of heating conditions have been applied for different flow rates. Water and titanium dioxide (TiO2) nanofluid 1% vol are the liquid media used for cooling. Laminar flow is assumed for two different Reynolds numbers of 1000 and 2000. The results of the study have shown that the twisted tape insert increases the thermal efficiency of the pipe more than the porous media insert and the plain pipe. In addition, different temperature readings in the cross section of the pipe have indicated that the twisted tape helps mixing up the fluid and provides a constant temperature in the overall volume of the fluid, whereas for the porous media insert and plain pipe the fluid temperature increases in the fluid particles close to the pipe inner surface. TiO2 nanofluid exhibited an enhancement when compared to water for a plain and porous pipe. However, this enhancement was absent when a twisted insert is used.

The Effects of Thermophoresis and Brownian Motion on the Flow of a Nanofluid in Rectangular Channels Using Buongiorno’s Model

“…The optimal concentration was selected by calculating the thermal efficiency ratios for each concentration, and on that basis, SiC-water with a 3%wt concentration was deemed to be the optimal concentration. Saghir et al [34] investigated the effects of a porous copper insert and a copper twisted tape insert in a pipe where water and TiO2-water were the working fluids of the system. A heat flux of 50000W/m 2 was applied to the mid section of the pipe.…”

Hybrid forced-buoyancy convection in a channel with a backward facing step

“…A channel (or duct) with a backward facing step (BFS) can be regarded as an archetypal system for the analysis of many problems with practical or technological relevance. Inherently multidisciplinary, this fundamental fluid-dynamic subject really stands at the interface between different technological fields, which include (but are not limited to) mechanical, civil and aeronautical engineering (e.g., the interaction of gas currents with vehicles, buildings and airfoils at a large angle of attack, see, e.g., Skinner and Behtash [1] , Omidvar et al [2] ), thermal engineering (combustors, condensers, industrial heat exchangers, see, e.g., Delgado-Buscalioni and Crespo del Arco [3] ; Plant and Saghir [4] ; Papazian et al [5] ; Brottier and Bennacer [6] ; Souissi et al [7] ), and many other strictly related applications (e.g., the cooling of nuclear reactors, power plants and various types of electronic equipment, Sun and Jaluria [8] ).…”

Storing Energy from External Power Supplies Using Phase Change Materials and Various Pipe Configurations

“…It was found that all twisted tapes with non-uniform length had higher heat transfer coefficient and Nusselt number values than uniform twisted tape length. An article by K. Papazian et al [22] looks at thermal performance and efficiency of a circular pipe with two inserts, one with a porous medium with porosity of 0.91, and the other a single twist solid insert. It was determined that the twisted tape insert increases thermal efficiency than the porous media insert.…”