Advanced Design and Performance of Twisted Pipe Double Tube Heat Exchangers with Nano Fluids

Abstract

Heat exchangers are used to transfer heat between fluids. Both liquids' temperatures could alter as they pass through the exchanger. If neither fluid is going through a phase shift, the energy that is exchanged between streams causes variation in temperature in each stream of fluid. Throughout an exchanger, the temperature differential across the heat transfer barrier varies due to the constant change in temperature levels within the exchanger. Other economic considerations include the original cost of the exchangers, the space needed, the unit's needed lifespan, and the ease of maintenance of the unit. Heat exchangers with double pipes are the most basic recuperates for transferring heat from hot to the cold fluid. Heat exchangers with twisted pipe double tubes are made up of two concentric tubes, one inside the other. The inner tube is twisted to produce a helical flow route. This design enhances heat transfer efficiency by inducing swirl and turbulence in the fluid.

In the current work, two alternative flow patterns (parallel and counter flow) are used to calculate pressure, temperature, and velocity characteristics. To determine which design of double pipe heat exchanger (straight pipe or twisted pipe) had the best flow pattern type (parallel, counter), and which nanoparticles would raise an object's heat transfer rate, the same amount of boundary conditions, nanoparticles, and calculations were used to compare the results of the two designs.