2024 FDMP Review Series: Unveiling the Future of Fluid Dynamics & Materials Science
Tech Science Press
TSP publishes online periodicals and books, also hosts academical conferences.
Dive into the latest advancements in fluid dynamics and materials processing with?Fluid Dynamics & Materials Processing (FDMP)! In 2024, FDMP published four captivating review articles, each shedding light on cutting-edge topics—from bubble column hydrodynamics to granular matter under vibration, continuum mechanics invariants, and hydrodynamic cavitation for pollutant degradation. These reviews not only summarize decades of research but also map out exciting future directions, making them essential reads for scientists and engineers alike.
Discover the Reviews:
by Ayat N. Mahmood, Amer A. Abdulrahman, Laith S. Sabri, Abbas J. Sultan, Hasan Shakir Majdi, Muthanna H. Al-Dahhan
Hydrodynamics characterization in terms of flow regime behavior is a crucial task to enhance the design of bubble column reactors and scaling up related methodologies. This review presents recent studies on the typical flow regimes established in bubble columns. Some effort is also provided to introduce relevant definitions pertaining to this field, namely, that of “void fraction” and related (local, chordal, cross-sectional and volumetric) variants. Experimental studies involving different parameters that affect design and operating conditions are also discussed in detail. In the second part of the review, the attention is shifted to cases with internals of various types (perforated plates, baffles, vibrating helical springs, mixers, and heat exchanger tubes) immersed in the bubble columns. It is shown that the presence of these elements has a limited influence on the global column hydrodynamics. However, they can make the homogeneous flow regime more stable in terms of transition gas velocity and transition holdup value. The last section is used to highlight gaps which have not been filled yet and future directions of investigation.
by Peter Watson, Sebastien Vincent Bonnieu, Marcello Lappa
We present a short retrospective review of the existing literature about the dynamics of (dry) granular matter under the effect of vibrations. The main objective is the development of an integrated resource where vital information about past findings and recent discoveries is provided in a single treatment. Special attention is paid to those works where successful synthetic routes to as-yet unknown phenomena were identified. Such landmark results are analyzed, while smoothly blending them with a history of the field and introducing possible categorizations of the prevalent dynamics. Although no classification is perfect, and it is hard to distillate general properties out of specific observations or realizations, two possible ways to interpret the existing results are defined according to the type of forcing or the emerging (ensuing) regime of motion. In particular, first results concerning the case where vibrations and gravity are concurrent (vertical shaking) are examined, then the companion situation with vibrations perpendicular to gravity (horizontal shaking) is described. Universality classes are introduced as follows: (1) Regimes where sand self-organizes leading to highly regular geometrical “pulsating” patterns (thin layer case); (2) Regimes where the material undergoes “fluidization” and develops an internal multicellular convective state (tick layers case); (3) Regimes where the free interface separating the sand from the overlying gas changes inclination or develops a kind a patterned configuration consisting of stable valleys and mountains or travelling waves; (4) Regimes where segregation is produced, i.e., particles of a given size tend to be separated from the other grains (deep containers). Where possible, an analogy or parallelism is drawn with respect to the companion field of fluid-dynamics for which the assumption of “continuum” can be applied.
by Artur V. Dmitrenko, Vladislav M. Ovsyannikov
The differential equations of continuum mechanics are the basis of an uncountable variety of phenomena and technological processes in fluid-dynamics and related fields. These equations contain derivatives of the first order with respect to time. The derivation of the equations of continuum mechanics uses the limit transitions of the tendency of the volume increment and the time increment to zero. Derivatives are used to derive the wave equation. The differential wave equation is second order in time. Therefore, increments of volume and increments of time in continuum mechanics should be considered as small but finite quantities for problems of wave formation. This is important for calculating the generation of sound waves and water hammer waves. Therefore, the Euler continuity equation with finite time increments is of interest. The finiteness of the time increment makes it possible to take into account the quadratic and cubic invariants of the strain rate tensor. This is a new branch in hydrodynamics. Quadratic and cubic invariants will be used in differential wave equations of the second and third order in time.
by Xiufeng Zhu, Jingying Wang
SR-AOP (sulfate radical advanced oxidation process) is a novel water treatment method able to eliminate refractory organic pollutants. Hydrodynamic cavitation (HC) is a novel green technology, that can effectively produce strong oxidizing sulfate radicals. This paper presents a comprehensive review of the research advancements in these fields and a critical discussion of the principal factors influencing HC-enhanced SR-AOP and the mechanisms of synergistic degradation. Furthermore, some insights into the industrial application of HC/PS are also provided. Current research shows that this technology is feasible at the laboratory stage, but its application on larger scales requires further understanding and exploration. In this review, some attention is also paid to the design of the hydrodynamic cavitation reactor and the related operating parameters.
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