Iranian Journal of Mechanical Engineering Transactions of ISME

Iranian Journal of Mechanical Engineering Transactions of ISME

Numerical Simulation on the Effect of Magnetic Field Changes, Screw Pitch and Angle of the Spiral Tube on Heat Transfer Enhancement

Authors
Amin Alami nia 1
Mehdi Malekizadeh 2
1 Assistant Professor, Department of Mechanical Engineering, Azarbaijan Shahid Madani University, Tabriz, 53751-71379, Iran
2 MS.c., Department of Mechanical Engineering, Azarbaijan Shahid Madani University, Tabriz, 53751-71379, Iran
10.30506/ijmep.2024.2001105.1933
Abstract
In the present study, the effect of the angle and pitch of the spiral pipe on the rate of heat transfer through the wall of the pipe to the fluid passing through it in quiet, transition and turbulent flows has been studied Next the changes in Nusselt number due to the addition of nanoparticles TiO2 were investigated. Finally, the effect of applying a magnetic field with an intensity of 1 Tesla on the rate of heat transfer in different situations has been investigated. To do this, the spiral tube is considered in three different pitches of 10, 12.5 and 15 cm and three angles of 0, 45 and 90 degrees. According to the results, the Nusselt number increases with decreasing pitch and in different Reynolds, the Nusselt number reaches its highest value in 10 cm pitch. This number also changes with changing angle and has the highest and lowest values ​​at 45° and 90° angles, respectively. Then TiO2 nanoparticles with mass percentages of 0.1%, 0.3% and 0.5% were added to the fluid, which increased the Nusselt number.
It was observed that increasing the concentration of nanoparticles causes a higher Nusselt number. This number reaches its highest value in the coil with a pitch of 10 cm, angle of 45 degrees, Reynolds 15000 and in a concentration of 0.5% TiO2, and for this case the PEC number was calculated to be 1.1154. Next, a magnetic field with an intensity of one Tesla was applied in the direction of the main axis of the coil and it was observed that the Nusselt number increased and in a pitch of 10 cm, an angle of 45 degrees, Reynolds 15000 and a concentration of 0.5% TiO2 reaches its maximum value of 166.6. Finally, Hartmann number was calculated for the spiral tube, the maximum value of which was obtained in pitch of 15 cm and a concentration of 0.5% TiO2 and was equal to 43.83.
Keywords
Heat transfer
Spiral tube
Magnetic field
Numerical simulation
Screw pitch
Screw angle

Subjects

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  • Receive Date 30 August 2023
  • Revise Date 10 January 2024
  • Accept Date 27 February 2024