Experimental and Numerical Investigation of Flow Instability

A special issue of Aerospace (ISSN 2226-4310). This special issue belongs to the section "Aeronautics".

Deadline for manuscript submissions: closed (31 December 2024) | Viewed by 1053

Special Issue Editor


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Guest Editor
Department of Mechanical Engineering, University of Manitoba, 75A Chancellors Circle, Winnipeg, MB, Canada
Interests: flow stability; acoustics; compressible flow; heat transfer; aerodynamics; supercritical flow dynamics

Special Issue Information

Dear Colleagues,

Flow instability is an important research topic in the fields of aerospace, nuclear, and mechanical engineering and unstable flow behavior can affect system performance and cause cooling degradation, overheating with possible meltdown, mechanical vibration, pressure pulsations, and reduced system efficiency. Advanced numerical simulation and experimental methods are important means to study the onset of flow instability and the causes of unstable flow behavior. Recently, there have been a number of works on supercritical flow stability using experimental methods, advanced numerical simulation, and linear stability methods. Yet, their success has been varied and inconsistent, pointing to the need for continued research. Nevertheless, numerical simulation and experimentation remain important as they allow us to learn more about how to reduce the onset of unstable flow behavior and eliminate it altogether.

This Special Issue on “Experimental and Numerical Investigation of Flow Instability” seeks high-quality research works focusing on numerical simulation and experimental methods. Topics include, but are not limited to:

  • Flow instability phenomena;
  • Single-channel and parallel-channel experiments;
  • The effects of heating structures;
  • Heat transfer and deteriorated heat transfer;
  • Linear and nonlinear solutions.

Dr. Vijay Chatoorgoon
Guest Editor

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Keywords

  • flow instability
  • supercritical flow dynamics
  • unsteady flow
  • linear and nonlinear solutions
  • experiments
  • natural circulation loops
  • parallel channels

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Published Papers (1 paper)

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Research

26 pages, 4712 KiB  
Article
An Experimental Study on the Flow Boiling Heat Transfer Characteristics of Deionized Water Under Rotational Hypergravity
by Gen Li, Yiling Zhao, Xiaojie Zhang, Jianxun Xie and Xiande Fang
Aerospace 2025, 12(2), 75; https://doi.org/10.3390/aerospace12020075 - 21 Jan 2025
Viewed by 759
Abstract
Flow boiling heat transfer in micro-channels under hypergravity conditions is a crucial research area for developing efficient cooling systems in aerospace applications. This experimental study investigated the flow boiling heat transfer characteristics of deionized water in a tube with a 2 mm diameter [...] Read more.
Flow boiling heat transfer in micro-channels under hypergravity conditions is a crucial research area for developing efficient cooling systems in aerospace applications. This experimental study investigated the flow boiling heat transfer characteristics of deionized water in a tube with a 2 mm diameter under various gravitational conditions ranging from normal gravity (1 g) to hypergravity (up to 5.1 g) by employing a centrifugal rotating platform. The study systematically analyzes the effects of gravity level, vapor quality, mass flux, and heat flux on the flow boiling heat transfer coefficient (HTC) of deionized water. Experimental results reveal that hypergravity significantly influenced the HTC at a higher vapor quality with up to a 40% deviation and was less pronounced at lower values with an approximately 10% deviation. This deterioration is attributed to the complex interplay of centrifugal force, the Coriolis force, buoyancy, and the specific properties of water, leading to vapor–liquid stratification and hindering effective heat transfer. Meanwhile, critical heat flux was found to increase with increasing gravity acceleration at high vapor qualities. This enhancement is attributed to improved buoyancy effects, liquid replenishment, and altered flow patterns under hypergravity conditions. Furthermore, five existing correlations for predicting flow boiling HTCs were evaluated against the experimental data, and all the correlations showed overestimated results. The consistent over-prediction by these correlations highlights the need for modifications to better capture heat transfer mechanisms under hypergravity conditions. Full article
(This article belongs to the Special Issue Experimental and Numerical Investigation of Flow Instability)
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