Searched for: subject%3A%22Porous%255C%2Bmaterials%22
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Nicasy, R. (author), Huinink, H.P. (author), Erich, S.J.F. (author), Adan, O.C.G. (author)
An improved High-Speed NMR profiling method is introduced that enables to measure capillary action in thin, non-transparent porous media. Liquid profiles can be measured as fast as 10 ms with a spatial resolution of 14.5 µm. Capillary absorption of microliter-sized droplets into non-transparent nylon-6,6 porous membranes was studied. In nylon-6...
article 2021
document
Kahrobaei, S. (author), Farajzadeh, R. (author)
A potential solution to mitigate the adverse effects of viscous fingering, gravity override, and reservoir heterogeneity on the efficiency of gas injection in porous media is to inject the gas with a solution containing surface-active agents such as surfactants or nanoparticles. The efficiency of these processes largely depends on the generation...
article 2019
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Kahrobaei, S. (author), Farajzadeh, R. (author)
A potential solution to mitigate the adverse effects of viscous fingering, gravity override, and reservoir heterogeneity on the efficiency of gas injection in porous media is to inject the gas with a solution containing surface-active agents such as surfactants or nanoparticles. The efficiency of these processes largely depends on the generation...
conference paper 2019
document
Kuijpers, C.J. (author), Huinink, H.P. (author), Tomozeiu, N. (author), Erich, S.J.F. (author), Adan, O.C.G. (author)
Due to the increased use of nanoparticles in everyday applications, there is a need for theoretical descriptions of particle transport and attachment in porous media. It should be possible to develop a one dimensional model to describe nanoparticle retention during capillary transport of liquid mixtures in porous media. Water-glycerol...
article 2018
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Lubelli, B. (author), Cnudde, V. (author), Diaz-Goncalves, T. (author), Franzoni, E. (author), van Hees, R.P.J. (author), Ioannou, I. (author), Menendez, B. (author), Nunes, C. (author), Siedel, H. (author), Stefanidou, M. (author), Verges-Belmin, V. (author), Viles, H. (author)
The durability of building materials with respect to salt crystallization is commonly determined by accelerated weathering tests, carried out in the laboratory. An effective laboratory weathering test should assess the durability and, in the case of conservation of historic buildings, the compatibility of repair materials with those existing....
article 2018
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Granneman, S.J.C. (author), Lubelli, B. (author), van Hees, R.P.J. (author)
Although salt crystallization damage is a widespread damage process in the porous materials of our built cultural heritage, no definite solution yet exists to improve the durability of materials with respect to salt crystallization. Most research focuses on improving material properties, whereas only few studies concentrate on changing the...
conference paper 2016
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Bekker, M. (author), Erich, S.J.F. (author), Hermanns, S.P.M. (author), van Maris, M.P.F.H.L. (author), Huinink, H.P. (author), Adan, O.C.G. (author)
Fungal growth in the indoor environment can affect human health by causing allergic reactions and respiratory symptoms. In the search for a solution to prevent or limit fungal growth in the indoor environment it is important to know how parameters such as temperature, substrate, and humidity affect fungal growth. Up to now, no general accepted...
article 2015
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Hanea, A. (author), Hanea, R. (author), Zilko, A. (author)
The objective of reservoir engineering is to optimize hydrocarbon recovery. One of the most common and efficient recovery processes is water injection. The water is pumped into the reservoir in injection wells in order to push the oil trapped in the porous media towards the production wells. The movement of the water front depends on the...
conference paper 2012
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Miorali, M. (author), Slob, E.C. (author), Arts, R.J. (author)
In this paper we present laboratory experiments where we address the Ground Penetrating Radar (GPR) capability of monitoring oil displacement processes in porous media. This has significant applications in near-subsurface environments where remediation of contaminant such as oil-derived liquids is considered one of the major technical,...
conference paper 2011
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Sawdy, A. (author), Lubelli, B. (author), Voronina, V. (author), Pel, L. (author), TNO Bouw en Ondergrond (author)
Poultices are often used to extract salts from salt-deteriorated objects, but the results achieved can be highly variable. Currently, poulticing materials and methodologies are selected empirically, but many variables affect the treatment outcome, so achieving the 'best fit' between available materials, application methods and substrate...
article 2010
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Petković, J. (author), Huinink, H.P. (author), Pel, L. (author), Kopinga, K. (author), van Hees, R.P.J. (author), TNO Bouw en Ondergrond (author)
We have investigated whether a plaster which has two plaster layers with different pore sizes can act as a salt accumulating plaster system, in which salt crystallizes in the base layer of the plaster and not in the substrate or at the external surface. We used two substrates; fired-clay brick and Bentheim sandstone. On the substrate we applied...
article 2010
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Gryzlov, A. (author), Leskens, M. (author), Mudde, R.F. (author), TNO Industrie en Techniek (author)
An assessment of the time-integration scheme impact on results of data assimilation based on the extended Kalman filter approach is performed. The use of the implicit Euler scheme, which is unconditionally stable for the whole range of time steps both for the model and covariance update, results in a less accurate estimation of permeability...
conference paper 2009
document
TNO Bouw en Ondergrond (author), Shamalta, M. (author), Breunese, A. (author), Peelen, W. (author), Fellinger, J. (author)
In this paper, the phenomenon of spalling of concrete in fire has been studied using a numerical model. Spalling is the violent or non-violent breaking off of layers or pieces of concrete when it is exposed to high temperatures as experienced in fires. The types and mechanisms of spalling have been explained. A numerical model has been developed...
article 2005
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Zijl, W. (author), Nawalany, M. (author), Nederlands Instituut voor Toegepaste Geowetenschappen TNO (author)
We present a velocity-oriented discrete analog of the partial differential equations governing porous media flow: the edge-based face element method. Conventional finite element techniques calculate pressures in the nodes of the grid. However, such methods do not satisfy the requirement of flux continuity at the faces. In contrast, the edge...
article 2004
document
Zijl, W. (author), Nederlands Instituut voor Toegepaste Geowetenschappen TNO (author)
Inverse models to determine the permeability are generally based on existing forward models for the pressure. The permeabilities are adapted in such a way that the calculated pressures match the specified pressures in a number of points. To assimilate a priori knowledge about the flux, we introduce the 'flux assimilation method', which is based...
article 2004
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Wipfler, E.L. (author), van Dijke, M.I.J. (author), van der Zee, S.E.A.T.M. (author)
We considered dense nonaqueous phase liquid (DNAPL) infiltration into a water-unsaturated porous medium that consists of two horizontal layers, of which the top layer has a lower intrinsic permeability than the bottom layer. DNAPL is the intermediate-wetting fluid with respect to the wetting water and the nonwetting air. The layer interface...
article 2004
document
Lubelli, B. (author), van Hees, R.P.J. (author), Brocken, H.J.P. (author)
Salt crystallisation is one of the main causes of masonry decay in monuments. The salt content in a wall is a very important parameter that should be known in order to give a reliable diagnosis on the causes of damage; if a restoration work and a surface treatment are necessary, the salt content has to be known. In fact the presence of salts in...
article 2004
document
Jimenez Pique, E. (author), Dortmans, L.J.M.G. (author), de With, G. (author), Technisch Physische Dienst TNO - TH (author)
Fracture tests were performed on a granular polymethyl methacrylate porous material used as a mould for white were castings. Two types of sample geometry (single-edge notch beam and wedge opening load) and two types of environment (dry at room temperature and in water at 45°C) were used and the force-displacement curves were measured. The...
article 2002
document
Dortmans, L.J.M.G. (author), Fischer, H.R. (author), Nelissen, R. (author), Technisch Physische Dienst TNO - TH (author)
The lifetime of porous polymer moulds used for pressure casting of sanitaryware has been analysed, modelled and improved. The mechanical behaviour of the existing porous PMMA mould material was analysed using mechanical tests to assess the lifetime under cyclic loading. The relevant stress levels were obtained through in-situ strain gauge...
article 2002
document
Linders, M.J.G. (author), van den Broeke, L.J.P. (author), Nijhuis, T.A. (author), Kapteijn, F. (author), Moulijn, J.A. (author)
A novel low pressure pulse-response technique, referred to as Multitrack, was applied for the simultaneous determination of the adsorption and diffusion parameters of gases in porous materials in a packed bed. Measurements were performed on two different carbons, Kureha and Sorbonorit B3, in the temperature range between 473 and 700 K. The...
article 2001
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