Iranian Journal of Mechanical Engineering Transactions of ISME

Iranian Journal of Mechanical Engineering Transactions of ISME

An Exprimental Study on Bubble Growth and Departure in Pool Boiling on Wire Mesh and Providing Empirical Relations

Authors
1 PhD. Candidate, Department of Mechanical Engineering, University of Hormozgan, Bandar Abbas, Iran
2 Assistant Professor, Department of Mechanical Engineering, University of Hormozgan, Bandar Abbas, Iran
3 Professor, Department of Mechanical Engineering, University of Hormozgan, Bandar Abbas, Iran
4 Associate Professor, Department of Mechanical Engineering, University of Hormozgan, Bandar Abbas, Iran
Abstract
The present study examined the pool boiling process in a specific geometry by designing, constructing a laboratory complex and Providing Empirical Relations. Investigation of pool boiling process, electrical resistance, critical heat flux, heat transfer coefficient, bubble growth and departure, bubble growth frequency, and nucleation site density by applying heat flux to critical heat flux was carried out on wire mesh element in deionized water at different temperatures. According to the results, increasing the size of mesh and fluid temperature decreased the critical heat flux. In the case of a wire mesh with a constant size of mesh, a fluid with a constant temperature, and the use of heat flux values less than the critical heat flux, the wire temperature increased, but it decreased in the case of increasing the size of mesh, a fluid with a constant temperature and applying critical heat flux values. In the case of a constant size of mesh, the heat transfer coefficient was constant by increasing fluid temperature at values of heat flux less than the critical heat flux, but the heat transfer coefficient was increased with increasing values of heat flux less than the critical heat flux and decreased at critical heat flux values. By increasing 4 times the mesh size in the fluid at 30, 70 and 100°C in the critical heat flux, the heat transfer coefficient decreases by 0.7%. The maximum bubble growth frequency is related to the 0.5 mm wire mesh in 100°C fluid with 0.0763 bubbles per millisecond.
Keywords

Subjects


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  • Receive Date 25 December 2022
  • Revise Date 10 April 2023
  • Accept Date 16 April 2023