Heat Transfer in Pipe with Twisted Tape Inserts (Validation)
The simulation process is based on the data in the reference article “Analysis of Heat Transfer in Pipe with Twisted Tape Inserts” and the results are compared with the results in the paper and validated.
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The present problem simulates heat transfer within a tube that has a twisted strip inside it, using ANSYS Fluent software. The simulation process is based on the data in the reference article [Analysis of Heat Transfer in Pipe with Twisted Tape Inserts] and the results are compared with the results in the paper and validated. The model is related to a tube inside which a twisted strip with a certain screw pitch is placed inside. In the present model, the value of the ratio of the pitch of the twisted strip to the diameter of the tube is equal to 5.
The fluid flowing inside this pipe is water with a Reynolds equals 800 and, as a result, the flow velocity of the incoming water is equal to 0.0365 m.s-1. Also, the inlet water flow temperature to the pipe is equal to 298.15 K and the pipe wall is under a constant heat flux equal to 5725 W.m-2. The strip inside the pipe is thermally insulated and is solely responsible for affecting the amount of heat transfer from the wall of the pipe to the mass of fluid flowing inside the pipe. The purpose of this work is to investigate the amount of Nusselt number on the pipe wall.
Twisted Tape Geometry & Mesh
The present model is designed in three dimensions using Design Modeler software. The model consists of a tube with a diameter of 0.022 m and a length of 2.2 m, which in its interior has a twisted strip with a screw pitch equal to 0.110 m. Therefore, the ratio of the tape screw pitch to the pipe diameter is equal to 5.
The meshing of the model has been done using ANSYS Meshing software and the mesh type is unstructured. The element number is 476442. The following figure shows the mesh.
Heat Transfer CFD Simulation
To simulate the present model, several assumptions are considered:
- We perform a pressure-based solver.
- The simulation is steady.
- The gravity effect on the fluid is ignored.
A summary of the defining steps of the problem and its solution is given in the following table:
|velocity magnitude||0.0365 m.s-1|
|gauge pressure||0 Pascal|
|wall motion||stationary wall|
|heat flux||5725 W.m-2|
|wall motion||stationary wall|
|heat flux||0 W.m-2|
|Methods (Heat Transfer)
|momentum||second order upwind|
|turbulent kinetic energy||second order upwind|
|specific dissipation rate||second order upwind|
|energy||second order upwind|
|Initialization (Heat Transfer)
|gauge pressure||0 pascal|
Paper Validation Results
At the end of the solution process, the value of the Nusselt number is obtained on the pipe wall. This value was obtained when the Reynolds value of the flow is equal to 800 and the ratio of the pitch of the twisted strip to the diameter of the pipe is equal to 5. Calculating the Nusselt value requires the correct reference values; So that in the present model, the characteristic length is equal to the diameter of the pipe, ie 0.022 m, and the reference temperature is equal to the temperature of the fluid bulk inside the pipe, which is equivalent to 306.7147 K.
The comparison of the results of the present work with the results of the article and the validation of the results have been done using the diagram of Figure 2 of the reference paper.
|P/D||Re||Nusselt number @ paper||Nusselt number @ present work|
Also at the end, three-dimensional contours related to pressure, temperature and velocity as well as three-dimensional path lines are obtained.
All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.