Search results for: J.Y. Tu

Items from 1 to 20 out of 52 results

article

Dynamic meshing modelling for particle resuspension caused by swinging manikin motion

Y. Tao, K. Inthavong, J.Y. Tu

Building and Environment > 2017 > 123 > C > 529-542

Human-induced wake flow characteristics and its impact on particle re-dispersion from the floor was investigated by performing CFD simulations of a moving thermal manikin model. The manikin moved with realistic kinematic motion which included swinging arms and legs. This was performed using dynamic-meshing which updated the grid with each time step to represent the manikin motion. The wake flow and...

article

Computational fluid dynamics analysis of wall shear stresses between human and rat nasal cavities

Y. Shang, J.L. Dong, K. Inthavong, J.Y. Tu

European Journal of Mechanics - B/Fluids > 2017 > 61 > P1 > 160-169

Toxicology studies often use laboratory animals as surrogates for human subjects because of the relatively similar nasal anatomy that allows data extrapolation between species. An understanding of nasal airflow patterns, particularly wall shear stress can help better understand the causes of toxicant distribution and local dosimetry. A laminar, steady state flow was used to simulate light inhaled...

article

Numerical investigation on the gas entrainment of ventilated partial cavity based on a multiscale modelling approach

M. Xiang, K. Li, J.Y. Tu, H.W. Zhang

Applied Ocean Research > 2016 > 60 > C > 84-93

Ventilated cavitation which is acknowledged as an efficient drag reduction technology for underwater vehicle is characterised by the very disparate length and time scales, posing great difficulty in the application of this technology. A multiscale numerical approach which integrates a sub-grid air entrainment model into the two-fluid framework is proposed in this paper to resolve the complex flow...

article

Detailed micro-particle deposition patterns in the human nasal cavity influenced by the breathing zone

Y.D. Shang, K. Inthavong, J.Y. Tu

Computers & Fluids > 2015 > 114 > C > 141-150

The breathing region connects the nasal cavity with the outside environmental air where flow is accelerated through the nostrils. Particles introduced into the nasal cavity without considering the breathing region neglect the influence of facial features and realistic boundary conditions at the nostrils. In this study, a new nasal cavity model is reconstructed combining facial features and an ambient...

article

A mathematic model considering the effect of Brownian motion for subcooled nucleate pool boiling of dilute nanofluids

K. Li, X.D. Li, J.Y. Tu, H.G. Wang

International Journal of Heat and Mass Transfer > 2015 > 84 > C > 46-53

A new mathematic model was presented to investigate the nucleate pool boiling of nanofluids. The model considered the heat exchange due to Brownian motion of nanoparticles. A new closure correlation is also included in the model to count the active site density and the bubble departure diameter, which were calculated based on the experimental data of a nucleate pool boiling. The new model combines...

article

Efficiency of a two-phase nozzle for geothermal power generation

S. Vahaji, A.A. Akbarzadeh, A. Date, S.C.P. Cheung, more

Applied Thermal Engineering > 2014 > 73 > 1 > 229-237

In this paper, the performance of a two-phase nozzle, as an expander to generate power is studied. Mostly high pressure and temperature energy sources are investigated in the literature, whereas the possibility of utilizing low temperature energy remains sparsely covered. This paper aims to bridge this knowledge gap.Experiments involve with passing water having temperatures lower than 100 °C through...

article

A multi-fluid modelling approach for the air entrainment and internal bubbly flow region in hydraulic jumps

M. Xiang, S.C.P. Cheung, J.Y. Tu, W.H. Zhang

Ocean Engineering > 2014 > 91 > Complete > 51-63

This paper proposed a numerical modelling framework aiming to couple both Volume-Of-Fluid (VOF) model and MUltiple-SIze-Group (MUSIG) model to handle the formation of large-scale free surface, bubble entrainment and bubble dispersion in hydraulic oscillating jumps. To consider all essential physics, the modelling framework resolves and couples the flow structure of three different fluids (i.e. continuous...

article

Modeling subcooled flow boiling in vertical channels at low pressures – Part 2: Evaluation of mechanistic approach

G.H. Yeoh, S. Vahaji, S.C.P. Cheung, J.Y. Tu

International Journal of Heat and Mass Transfer > 2014 > 75 > Complete > 754-768

In this paper, the improved heat flux partitioning model based on first principal models of the underlying physics in determining the active nucleation site density, bubble size and bubble frequency is evaluated for subcooled flow boiling in vertical heated channels at low pressures. Salient features of this model include the fractal approach in determining the active nucleation site density, the...

article

Modeling subcooled flow boiling in vertical channels at low pressures – Part 1: Assessment of empirical correlations

S.C.P. Cheung, S. Vahaji, G.H. Yeoh, J.Y. Tu

International Journal of Heat and Mass Transfer > 2014 > 75 > Complete > 736-753

Modeling subcooled flow boiling in vertical channels at low pressures requires not only the consideration of the dynamic behaviors of two-phase flow and bubbles undergoing coalescence, breakup and condensation in the bulk subcooled liquid but also the characterization of the single-phase and local boiling heat transfer phenomena in the near-wall region. The focus of this paper is the assessment of...

article

A simple geometrical model for analyzing particle dispersion in a gravity-driven monolayer granular bed

N. Gui, X.T. Yang, J.Y. Tu, S.Y. Jiang

Powder Technology > 2014 > 254 > Complete > 432-438

A numerical study of gravity-driven monolayer granular flow in a contracted vertical silo is carried out using discrete element method. The bed dimension is 800×2000×12mm in wide, height, and depth directions, respectively, filled with 12,210 spherical granular particles of diameter of 12mm. The particles are loaded onto the bed from nine fixed points equally spaced at the top and discharged from...

article

Modeling of bubble size distribution in isothermal gas–liquid flows: Numerical assessment of population balance approaches

S.C.P. Cheung, L. Deju, G.H. Yeoh, J.Y. Tu

Nuclear Engineering and Design > 2013 > 265 > Complete > 120-136

Gas–liquid flows are commonly encountered in many industrial flow systems. In many cases, the evolution of bubble size distribution is a crucial factor governing the momentum, heat and mass transfer between phases within the system. Aiming to evaluate the capability of existing models, numerical assessment of three different population balance approaches – direct quadrature method of moments (DQMOM),...

article

Capturing coalescence and break-up processes in vertical gas–liquid flows: Assessment of population balance methods

L. Deju, S.C.P. Cheung, G.H. Yeoh, J.Y. Tu

Applied Mathematical Modelling > 2013 > 37 > 18-19 > 8557-8577

Gas–liquid flows are commonly encountered in industrial flow systems. Numerical studies have been performed to assess the performances of different population balance approaches – direct quadrature method of moments (DQMOMs), average bubble number density (ABND) model and homogeneous MUlti-SIze-Group (MUSIG) model – in tracking the changes of gas void fraction and bubble size distribution under complex...

article

Mechanism analysis of quasi-static dense pebble flow in pebble bed reactor using phenomenological approach

X.T. Yang, W.P. Hu, S.Y. Jiang, K.K.L. Wong, more

Nuclear Engineering and Design > 2012 > 250 > Complete > 247-259

By means of the four basic forms of the phenomenological method, experimental results have intuitionally disclosed the physical mechanism from various views of the quasi-static pebble flow in a pebble bed reactor and successfully verified the availability of the discrete element method, on which the parameter effects have been investigated, including different base cone angle and different friction...

article

Experimental and numerical validation of a two-region-designed pebble bed reactor with dynamic core

S.Y. Jiang, X.T. Yang, Z.W. Tang, W.J. Wang, more

Nuclear Engineering and Design > 2012 > 246 > Complete > 277-285

The pebble flow is the principal issue for the design of the pebble bed reactor. In order to verify the feasibility of a two-region-designed pebble bed reactor, the experimental installation with a taller vessel has been built, which is proportional to the real pebble bed reactor. With the aid of the experimental installation, the stable establishment and maintenance of the two-region arrangement...

article

Classification of bubbles in vertical gas–liquid flow: Part 1 – An analysis of experimental data

F.S. Qi, G.H. Yeoh, S.C.P. Cheung, J.Y. Tu, more

International Journal of Multiphase Flow > 2012 > 39 > Complete > 121-134

In consideration of the practical importance regarding the application of gas–liquid flow in a vertical pipe and the quest towards the development of more robust physical models to accurately predict the essential interfacial parameters of the two-phase flow, comprehensive analysis of the characteristics and phase distribution patterns of such a flow have been performed on both experimental measurements...

article

Classification of bubbles in vertical gas–liquid flow: Part 2 – A model evaluation

S.C.P. Cheung, G.H. Yeoh, F.S. Qi, J.Y. Tu

International Journal of Multiphase Flow > 2012 > 39 > Complete > 135-147

Three-fluid model along with two-group average bubble number density equations have been applied for the classification of bubbles in vertical gas–liquid flow. The current study focused on (i) consideration of three-fluid model transport equations governing the conservation of mass and momentum, (ii) formulation of two-group averaged bubble number density equations, (iii) classification of bubble...

article

On the prediction of the phase distribution of bubbly flow in a horizontal pipe

G.H. Yeoh, Sherman C.P. Cheung, J.Y. Tu

Chemical Engineering Research and Design > 2012 > 90 > 1 > 40-51

Horizontal bubbly flow is widely encountered in various industrial systems because of its ability to provide large interfacial areas for heat and mass transfer. Nonetheless, this particular flow orientation has received less attention when compared to vertical bubbly flow. Owing to the strong influence due to buoyancy, the migration of dispersed bubbles towards the top wall of the horizontal pipe...

article

Numerical research on drag reduction by ventilated partial cavity based on two-fluid model

M. Xiang, S.C.P. Cheung, J.Y. Tu, W.H. Zhang

Ocean Engineering > 2011 > 38 > 17-18 > 2023-2032

This paper presents a numerical study on the drag reduction mechanism created by a ventilated partial cavity and its associated effects by the downstream dispersed microbubbles. A semi-empirical approach is introduced to model the discrete interface of the ventilated cavity and its complex gas leakage rate induced by the local turbulent shear stress. Based on the Eulerian–Eulerian two-fluid modeling...

article

On the numerical study of bubbly flow created by ventilated cavity in vertical pipe

M. Xiang, S.C.P. Cheung, G.H. Yeoh, W.H. Zhang, more

International Journal of Multiphase Flow > 2011 > 37 > 7 > 756-768

The dispersion of bubbles into a down-liquid flow in a vertical pipe is investigated. At low flow rates, the intended design of a swarm of discrete bubbles is achieved. At high flow rates, a ventilated cavity is nonetheless formed, which is attached close to the gas sparger. Behind this ventilated cavity, three different flow regimes characterize the complex bubbly flow field downstream of the down-liquid...

article

Gas–liquid flows in medium and large vertical pipes

X.Y. Duan, S.C.P. Cheung, G.H. Yeoh, J.Y. Tu, more

Chemical Engineering Science > 2011 > 66 > 5 > 872-883

Gas–liquid bubbly flows with wide range of bubble sizes are commonly encountered in many industrial gas–liquid flow systems. To assess the performances of two population balance approaches – Average Bubble Number Density (ABND) and Inhomogeneous MUlti-SIze-Group (MUSIG) models – in tracking the changes of gas volume fraction and bubble size distribution under complex flow conditions, numerical studies...

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International Journal of Heat and Mass Transfer (8)
Building and Environment (4)
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International Journal of Multiphase Flow (4)
Nuclear Engineering and Design (4)
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Ocean Engineering (3)
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Journal of Biomechanics (2)
Journal of Fluids and Structures (2)
Applied Ocean Research (1)
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Computers in Biology and Medicine (1)
European Journal of Mechanics - B/Fluids (1)
Journal of Aerosol Science (1)
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INFONA - science communication portal

Search results for: J.Y. Tu

Dynamic meshing modelling for particle resuspension caused by swinging manikin motion

Computational fluid dynamics analysis of wall shear stresses between human and rat nasal cavities

Numerical investigation on the gas entrainment of ventilated partial cavity based on a multiscale modelling approach

Detailed micro-particle deposition patterns in the human nasal cavity influenced by the breathing zone

A mathematic model considering the effect of Brownian motion for subcooled nucleate pool boiling of dilute nanofluids

Efficiency of a two-phase nozzle for geothermal power generation

A multi-fluid modelling approach for the air entrainment and internal bubbly flow region in hydraulic jumps

Modeling subcooled flow boiling in vertical channels at low pressures – Part 2: Evaluation of mechanistic approach

Modeling subcooled flow boiling in vertical channels at low pressures – Part 1: Assessment of empirical correlations

A simple geometrical model for analyzing particle dispersion in a gravity-driven monolayer granular bed

Modeling of bubble size distribution in isothermal gas–liquid flows: Numerical assessment of population balance approaches

Capturing coalescence and break-up processes in vertical gas–liquid flows: Assessment of population balance methods

Mechanism analysis of quasi-static dense pebble flow in pebble bed reactor using phenomenological approach

Experimental and numerical validation of a two-region-designed pebble bed reactor with dynamic core

Classification of bubbles in vertical gas–liquid flow: Part 1 – An analysis of experimental data

Classification of bubbles in vertical gas–liquid flow: Part 2 – A model evaluation

On the prediction of the phase distribution of bubbly flow in a horizontal pipe

Numerical research on drag reduction by ventilated partial cavity based on two-fluid model

On the numerical study of bubbly flow created by ventilated cavity in vertical pipe

Gas–liquid flows in medium and large vertical pipes

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