Selected Papers from International Meet & Expo on Fluid Mechanics and Thermodynamics

A special issue of Thermo (ISSN 2673-7264).

Deadline for manuscript submissions: closed (28 February 2026) | Viewed by 1497

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Department of Industrial Engineering, Università degli Studi di Napoli Federico II, 80125 Napoli, Italy
Interests: heat transfer; cellular materials; porous materials; topology optimization; thermal management; bioheat transfer; multi-objective optimization; batteries’ thermal management; thermal storage; electronic cooling; hyperthermia
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Dear Colleagues,

Currently, the role of fluid mechanics and thermodynamics in science is significant. Moreover, it will be of primary importance in many engineering-related fields, both in the near and distant future. For example, available and emerging technologies, such as nuclear fusion, nanotechnologies, microfluidics, and many others, require important scientific contributions from the fluid mechanics community. The aim of this Special Issue for the International Meet & Expo on Fluid Mechanics and Thermodynamics (FLUIDMEET2025) is to collect papers on fluid mechanics and thermodynamics. Results coming from experimental, analytical, and numerical studies will be helpful in providing a perspective on new frontiers in fundamental and applied fluid mechanics and thermodynamics in engineering. Scientific contributions on topics, such as fundamentals of heat and mass transfer, computational fluid dynamics, biomass and bioenergy, cardiovascular fluid mechanics, micro- and nano-particle dynamics, energy efficiency in fluid systems, machine learning and AI in fluid mechanics, turbomachinery, experimental techniques, etc., are more than welcome.

Prof. Dr. Marcello Iasiello
Guest Editor

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Keywords

  • computational fluid dynamics
  • energy efficiency in fluid systems
  • turbomachinery
  • biomass and bioenergy
  • micro- and nano-particle dynamics
  • experimental techniques
  • machine learning and AI in fluid mechanics
  • combustion and reactive flows

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Published Papers (1 paper)

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Research

20 pages, 3637 KB  
Article
Analyzing the Influence of Bubble Velocity on Fluid Dynamics Considering Thermal and Water Height Effects via PIV
by Hassan Abdulmouti, Muhammed Elmnefi, Muhanad Hajjawi, Nawwal Ismael Ibrahim, Zakwan Skaf and Mazhar Azeem
Thermo 2026, 6(2), 24; https://doi.org/10.3390/thermo6020024 - 3 Apr 2026
Viewed by 582
Abstract
This study experimentally investigates the dynamics of air bubble plumes in water under varying thermal and hydrodynamic conditions using a two-dimensional Particle Image Velocimetry (PIV) system. The experimental setup consists of a transparent acrylic tank equipped with a bubble generator, a controlled heating [...] Read more.
This study experimentally investigates the dynamics of air bubble plumes in water under varying thermal and hydrodynamic conditions using a two-dimensional Particle Image Velocimetry (PIV) system. The experimental setup consists of a transparent acrylic tank equipped with a bubble generator, a controlled heating system, and a synchronized PIV arrangement to capture both bubble motion and the induced liquid flow field. Experiments were conducted over a range of water temperatures (21–60 °C), air flow rates, and water depths (200–600 mm) to systematically quantify their coupled influence on bubble plume behavior. The results demonstrate that bubble rising velocity (defined here as the mean vertical, buoyancy-driven component of bubble motion measured in the fully developed plume region) increases with water temperature, gas flow rate, and water depth. For a fixed gas flow rate and water depth, increasing the water temperature from 40 °C to 60 °C resulted in an approximately twofold increase in bubble rising velocity, primarily due to reduced liquid viscosity and enhanced buoyancy forces. Bubble velocity also increased with gas flow rate and water depth, reflecting stronger momentum input and extended acceleration distances within taller water columns. PIV-resolved velocity fields further reveal that the surrounding fluid velocity increases proportionally with bubble rising velocity and temperature, confirming a strong coupling between bubble motion and plume-induced circulation. The surrounding liquid velocity reached approximately 30–60% of the corresponding bubble rising velocity, depending on operating conditions. These findings provide quantitative experimental insight into the coupled effects of thermal conditions, gas injection rate, and liquid depth on bubble–liquid interactions. The results contribute valuable validation data for multiphase flow modeling and offer practical relevance for thermal–hydraulic, chemical, and environmental engineering applications involving bubble-driven transport processes. Full article
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