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van den Akker, H.E.A. (author), Mudde, R.F. (author)De transport- en overdrachtsprocessen van warmte, massa en impuls worden naar hun analogie behandeld. De processen worden beschreven met behulp van macro- en microbalansen die in veel gevallen leiden tot differentiaalvergelijkingen. Ook veel aspecten van stromingsleer komen op deze manier aan de orde en zo bereidt het boek ook voor op moderne...book 2023
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van den Akker, H.E.A. (author), Mudde, R.F. (author), Stammers, Ed (author)Deze vraagstukkenbundel is bedoeld als oefenmateriaal bij het bestuderen van de basiscolleges Fysische Transportverschijnselen, zoals die aan de TU Delft worden gegeven. De vraagstukken zijn afkomstig uit oude vraagstukkenbundels en uit recente tentamens. Wij hebben de formulering van veel van deze vraagstukken herzien.<br/><br/>Vooral door de...book 2023
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Jamshidian, Roya (author), Scully, James (author), van den Akker, H.E.A. (author)We report the findings of a detailed assessment of various options for computational two-fluid RANS simulations of an aerated agitated 2-L bioreactor equipped with a single baffle and several dip tubes. The simulations were carried out by using the commercial flow solver ANSYS/Fluent. Our focus was on (1) the outlet condition at the liquid's...journal article 2023
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Srinivasan, Sudharsan (author), van den Akker, H.E.A. (author), Shardt, Orest (author)We carried out 3D simulations of monodisperse particle suspensions subjected to a constant shear rate with the view to investigate the effect of electrical double layers around the particles on apparent suspension viscosities. To this end, expressions for Debye length, zeta potential, and ionic strength (pH) of the liquid were incorporated...journal article 2023
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O'Connell, Ken (author), Olaleye, Akeem K. (author), van den Akker, H.E.A. (author)The development of a novel numerical model for droplet drying is the topic of this paper. The three main stages of droplet drying are distinguished, viz. unhindered evaporation of a ’wet’ particle (the droplet), restricted drying at a falling rate due to the formation of a crust around a wet core, and inert heating of the dry porous particle....journal article 2023
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Srinivasan, Sudharsan (author), van den Akker, H.E.A. (author), Shardt, Orest (author)The understanding of the rheological behaviour of suspensions in aqueous electrolytes is necessary for the optimal design of hydraulic transport lines. In these applications, particle size is at least 10 micron, and the particle Reynolds number, Re<sub>p</sub>, is finite: O(10<sup>−1</sup>). Although there are some experimental and numerical...journal article 2022
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van den Akker, H.E.A. (author)This contribution to the journal issue commemorating Professor Robert Byron Bird focuses on his Dutch connection, which dates back to as early as 1950. Bird twice spent a semester-long period at (the current) Delft University of Technology. The development over time of two different schools of teaching transport phenomena and their mutual...journal article 2022
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Srinivasan, Sudharsan (author), van den Akker, H.E.A. (author), Shardt, Orest (author)Using an immersed boundary-lattice Boltzmann method, we investigated the response of dense granular suspensions to time-varying shear rates and flow reversals. The evolution of the relative apparent viscosity and particle structures was analysed. The concentration of solids (ϕ<sub>v</sub>) and particle Reynolds numbers (Re<sub>p</sub>) were...journal article 2021
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van den Akker, H.E.A. (author), Donkers, Renske (author), Zachariah, Githin T. (author), Shardt, Orest (author)The option of varying the molecular mass in multicomponent lattice Boltzmann simulations is being explored. First, results are presented for droplet formation at an aperture in a second immiscible liquid medium in which the difference in density between the two media is achieved by introducing asymmetry in the EOS, via adding particularly...journal article 2021
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van den Akker, H.E.A. (author), Hazelhoff Heeres, Doedo P. (author), Kloek, William (author)A spatially resolved one dimensional pressure filtration model was developed for a slurry of edible fat crystals. The model focuses on the expression step in which a cake is compressed to force the liquid through a filter cloth. The model describes the local oil flow in the shrinking cake modeled as a porous nonlinear elastic medium existing...journal article 2021
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Muilwijk, Corné (author), van den Akker, H.E.A. (author)This paper describes the effects of uniform and non-uniform liquid co-flow on the bubbly flow in a rectangular column (with two inlets) deliberately aerated unevenly. The two vertical bubbly streams, comprising uniform bubbles, started interacting downstream of the trailing edge of a splitter plate. This study quantifies the emergence of...journal article 2021
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Muilwijk, Corné (author), van den Akker, H.E.A. (author)Unique experiments were performed in a homogeneously sparged rectangular 400×200×2630 mm (W×D×H) bubble column with and without liquid co-flow. Bubbles in the range 4–7 mm were produced by needle spargers, which resulted in a very uniform bubble size. Dual-tip optical fibre probes were used to measure horizontal profiles of gas fractions,...journal article 2021
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Srinivasan, Sudharsan (author), van den Akker, H.E.A. (author), Shardt, Orest (author)Three-dimensional direct numerical simulations of dense suspensions of monodisperse spherical particles in simple shear flow have been performed at particle Reynolds numbers between 0.1 and 0.6. The particles translate and rotate under the influence of the applied shear. The lattice Boltzmann method was used to solve the flow of the...journal article 2020
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Mukherjee, S. (author), Safdari, Arman (author), Shardt, Orest (author), Kenjeres, S. (author), van den Akker, H.E.A. (author)We perform direct numerical simulations (DNS) of emulsions in homogeneous isotropic turbulence using a pseudopotential lattice-Boltzmann (PP-LB) method. Improving on previous literature by minimizing droplet dissolution and spurious currents, we show that the PP-LB technique is capable of long stable simulations in certain parameter regions....journal article 2019
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Olaleye, Akeem K. (author), Shardt, Orest (author), Walker, Gavin M. (author), van den Akker, H.E.A. (author)We performed an experimental and numerical investigation of pneumatic conveying of cohesive dairy powder. The experiments with fat-filled milk powder (FFMP) fines with an average particle size of 94 μm were carried out in a 2-inch diameter stainless steel pipe consisting of two 2.5 m horizontal sections connected to a 0.65 m vertical section...journal article 2019
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Mukherjee, S. (author), Berghout, Pieter (author), van den Akker, H.E.A. (author)We present a pseudopotential lattice Boltzmann method to simulate liquid–liquid emulsions with a slightly soluble surfactant. The model is investigated in 2-D, over a wide parameter space for a single, stationary, immiscible droplet, and surface tension reduction by up to 15% is described in terms of a surfactant strength Λ (which roughly...journal article 2018
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Mukherjee, S. (author), Zarghami, A. (author), Haringa, C. (author), van As, K. (author), Kenjeres, S. (author), van den Akker, H.E.A. (author)While various multiphase flow simulation techniques have found acceptance as predictive tools for processes involving immiscible fluids, none of them can be considered universally applicable. Focusing on accurate simulation of liquid-liquid emulsions at the scale of droplets, we present a comparative assessment of the single-component...journal article 2018
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Zarghami, A. (author), van den Akker, H.E.A. (author)In this paper, the thermohydrodynamics of an evaporating droplet is investigated by using a single-component pseudopotential lattice Boltzmann model. The phase change is applied to the model by adding source terms to the thermal lattice Boltzmann equation in such a way that the macroscopic energy equation of multiphase flows is recovered. In...journal article 2017
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Ashorynejad, H. (author), Javaherdeh, Koroush (author), van den Akker, H.E.A. (author)In the context of attempts to improve the performance of Proton Exchange Membrane (PEM) fuel cells with a heterogeneous porous gas diffusion layer (GDL) consisting of carbon paper, we investigated whether - and to which degree - pulsating the pressure in a single waveform cathode channel affects the flow field in the channel and the...journal article 2016
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Kamali, M.R. (author), Gillissen, J.J.J. (author), Van den Akker, H.E.A. (author), Sundaresan, S. (author)A lattice Boltzmann (LB) method is presented for solving the energy conservation equation in two phases when the phase change effects are included in the model. This approach employs multiple distribution functions, one for a pseudotemperature scalar variable and the rest for the various species. A nonideal equation of state (EOS) is introduced...journal article 2013
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