Simulation of Drying Characteristics of Evaporation from a Wet Particle in a Turbulent Pulsed Opposing Jet Contactor

Yahyaee, Ali; Esmailpour, Kazem; Hosseinalipour, Mostafa; Mujumdar, Arun S.

doi:10.1080/07373937.2013.834500

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…In addition, the relative strength of the various frequencies to each other changes with changing distance, indicating the changing modes of the jet. Recently, Hosseinalipour et al (2013), Yahyaee et al (2013) and Esmailpour et al (2015aEsmailpour et al ( , 2015b studied numerically the effect of flow pulsation on heat and mass transfer of impinging jets and the opposing jets configuration, using the RANS turbulence model. They investigated the effects of various parameters such as pulsation frequency and amplitude, excitation signal shape and the phase gap between jets.…”

Section: Introductionmentioning

confidence: 99%

Numerical study and POD snapshot analysis of flow characteristics for pulsating turbulent opposing jets

Bagheri

Esmailpour

Hoseinalipour

et al. 2019

HFF

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Purpose The purpose of this study is to investigate the coherent structures of pulsed opposing jets by large eddy simulation (LES) model and proper orthogonal decomposition (POD) snapshot method. Flow pulsation as an active flow control method is considered for the enhancement of transport phenomena in impinging jets. The effect of flow pulsation parameters such as pulsation signal shape and frequency on the vortical coherent structures, the energy content of primary modes and their variation are studied numerically. Design/methodology/approach In this study, flow field of turbulent pulsating opposing jets has been simulated using LES. The result of the simulation in different time steps (snapshots) are stored and POD is applied on the snapshots. In this study, the POD method and calculation of spatial modes has been done using OpenFOAM, and time coefficients have been calculated using a MATLAB code. Findings The results of this study show that the flow excitation has a great effect on the coherent structure formation and the energy containment of fundamental modes of the flow. When the flow was excited by a harmonic sinusoidal or step function, the turbulent kinetic energy accumulated in the set of primary modes. On the other hand, the pulsed opposing jets had more regularity compared to the steady jets. The shapes, patterns and energy values of dominant modes depended on the inlet pulsation signal. An increase in pulsation frequency leads to an augmentation in energy content of the primary modes. Research limitations/implications The predictions may be extended to include various pulsation conditions such as: various amplitudes, Reynolds number and aspect ratio. Practical implications The results of this study are a valuable source of information for active control of transport phenomena in opposing jet configurations which is used in different industrial applications such as cooling, combustion, reactors, heating and drying processes. Originality/value In this study, the coherent structures and energy content of primary modes was studied for the first time by LES model and POD snapshot method and a comprehensive discussion on numerical results is provided.

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Section: Introductionmentioning

confidence: 99%

Numerical study and POD snapshot analysis of flow characteristics for pulsating turbulent opposing jets

Bagheri

Esmailpour

Hoseinalipour

et al. 2019

HFF

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“…Jet impingement over a moist protrusion was studied based on conjugate heat and mass exchange, enabling studies of jet height, protrusion size, and flow rate by De Bonis and Ruocco [18]. A single wet particle in a two-dimensional pulsed opposing jet contractor (POJC) was analyzed by Yahyaee et al [19], showing an increased drying performance with increased pulsation amplitude and increased jet Re. Moisture was furthermore included in the work by Bai et al [20], where effects of a moving plate were considered.…”

Section: Introductionmentioning

confidence: 99%

Modelling the Evaporation Rate in an Impingement Jet Dryer with Multiple Nozzles

Ljung

Andersson

et al. 2017

International Journal of Chemical Engineering

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Impinging jets are often used in industry to dry, cool, or heat items. In this work, a two-dimensional Computational Fluid Dynamics model is created to model an impingement jet dryer with a total of 9 pairs of nozzles that dries sheets of metal. Different methods to model the evaporation rate are studied, as well as the influence of recirculating the outlet air. For the studied conditions, the simulations show that the difference in evaporation rate between single- and two-component treatment of moist air is only around 5%, hence indicating that drying can be predicted with a simplified model where vapor is included as a nonreacting scalar. Furthermore, the humidity of the inlet air, as determined from the degree of recirculating outlet air, has a strong effect on the water evaporation rate. Results show that the metal sheet is dry at the exit if 85% of the air is recirculated, while approximately only 60% of the water has evaporated at a recirculation of 92,5%.

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“…In other studies, phase difference between the nozzle exit velocity profiles and its potential to make the stagnation point oscillate between the two jets were investigated. This is so important in mixing behavior and drying . Kurnia and colleagues investigate the performance of impinging jet drying under various configurations .…”

Section: Introductionmentioning

confidence: 99%

Dynamical Study of Pulsed Impinging Jet with Time Varying Heat Flux Boundary Condition

Ghadi

Esmailpour

Hosseinalipour

et al. 2014

Heat Trans. Asian Res.

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Pulsed jets in different configuration are potentially considered for enhancing transport phenomenon generally. Flow and temperature field in a pulsed impinging jet are simulated numerically by solving the governing equations using the control volume method. Ensemble Averaging Method as well as Phase Averaging has been employed for reporting the results in this study. In order to simulate a pulsating jet, inlet velocity profile was exerted as a time dependent sinusoidal and step signals. The results of this simulation showed an oscillatory jet could lead to an increase in jet development and its cross section with the wall and also a more uniform Nusselt profile would be obtained compared to the steady jet. For parametric investigations and extracting flow and thermal characteristics of a pulsed impinging jet, the effects of various parameters including flow frequency and amplitude and heat flux frequency were considered. It has been seen that Nusselt number varies by the changes in frequency, amplitude and the type of the excitation. It has been shown that the oscillating impinging jet has a better performance rather than the steady case when the excitation amplitude and frequency increase. Finally, it is also observed how a thermal field is going to respond with two pulsating inputs.

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Simulation of Drying Characteristics of Evaporation from a Wet Particle in a Turbulent Pulsed Opposing Jet Contactor

Cited by 6 publications

References 27 publications

Numerical study and POD snapshot analysis of flow characteristics for pulsating turbulent opposing jets

Numerical study and POD snapshot analysis of flow characteristics for pulsating turbulent opposing jets

Modelling the Evaporation Rate in an Impingement Jet Dryer with Multiple Nozzles

Dynamical Study of Pulsed Impinging Jet with Time Varying Heat Flux Boundary Condition

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