Numerical Investigation of Heat Transfer on Laminar Flow in Circular Tube Fitted With Conical Spring Inserts and Nanotechnology

Abstract

Numerical investigation have been worked to study the process of heat transfer by using laminar forced convection of nanofluid, using the water as a basefluid and Alumina (Al 2 O 3) as nanoparticles in a three dimensional tube fitted with conical spring inserts under a constant heat flux. A Solid Works Software2012 is used to draw the geometries of heat exchanger in plain tube. Dimensions of 100cm, 2.2cm and 2.4 cm represent the straight copper tube length, inner diameter and outer diameter respectively. The conical spring inserts of 16mm-6mm coil diameter, 15cm length, pitch of 20mm and 4mm wire diameter. Those inserts were arranged into eight types. To predict the pressure of flow, heat transfer of heat exchanger and temperature distribution, numbers of governing equations under assumptions were utilized, such as energy equations, momentum and continuity. To get all of the computational results, commercial ANSYS Fluent copy package 14.0 with the assistance of solid works and Gambit software program along with the finite volume approach is used. Under constant heat flux, a constant heat flux of 10000 W/ m 2 and constant Reynolds' number of 2000, heat exchanger performance are investigated under the effect of different parameters. Including arrangement of conical spring inserts (A1 to A8) and volume consternation of nanoparticles (0.1%, 0.2%, and 0.3%).Significant improvement in the water heating process shown with the use of conical spring insert, indicating the enhancement of heat transfer between the water and hot tube surface.(A5) arrangement is the best type as shown in this study due to the increase in water temperature. Also, results show that the heat transfer is increases by using nanofluid and conical spring inserts together.