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This study focused on the analysis of laminar negative buoyant Boussinesq fountains generated by circular nozzles. The behavior of these fountains was thoroughly investigated using experiments and simulations. High-speed shadowgraphy and particle Image Velocimetry techniques were employed to study the jet dynamics. The high-speed images revealed that the jet initially ascended to a larger length, known as initial height, subsequently, it stabilised at a slightly shorter height known as steady state penetration height. The steady-state penetration height was estimated from the shadowgraphy data and validate with the Philippe et al.’s correlation. Additionally, three-dimensional simulations were performed using a commercial software to predict the jet development and the penetration height. Moreover, the transient flow behaviour was analysed both experimentally and numerically. Non-dimensionalised plots were plotted between \(Ri^{0.5}.H_s/D\) and Reynolds number which showed good agreement between the experimental, numerical and literature data.

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Experimental and Numerical Investigation of Negative Buoyancy Jets at Laminar Conditions

  • 会议论文

  • 发表日期：

    2025年

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  • P. V. Sai Hemant,
  • N. Aditya,
  • Ayan Sarkar,
  • K. Jishad,
  • Chockalingam Prathap

摘要

This study focused on the analysis of laminar negative buoyant Boussinesq fountains generated by circular nozzles. The behavior of these fountains was thoroughly investigated using experiments and simulations. High-speed shadowgraphy and particle Image Velocimetry techniques were employed to study the jet dynamics. The high-speed images revealed that the jet initially ascended to a larger length, known as initial height, subsequently, it stabilised at a slightly shorter height known as steady state penetration height. The steady-state penetration height was estimated from the shadowgraphy data and validate with the Philippe et al.’s correlation. Additionally, three-dimensional simulations were performed using a commercial software to predict the jet development and the penetration height. Moreover, the transient flow behaviour was analysed both experimentally and numerically. Non-dimensionalised plots were plotted between \(Ri^{0.5}.H_s/D\) and Reynolds number which showed good agreement between the experimental, numerical and literature data.