Manufacturing of metallic porous structures to be used in capillary pumping systems

Reimbrecht, Eduardo Gonçalves; Bazzo, Edson; Almeida, Luis Henrique Seabra; Silva, Henrique Cislagui da; Binder, Cristiano; Muzart, J.L.R.

doi:10.1590/s1516-14392003000400009

Cited by 6 publications

(4 citation statements)

References 5 publications

(8 reference statements)

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“…Reduction in CA values of surfaces due to long-term exposures to NaCl solution (Table 2) could be attributed to the occurrence of pitting on their surfaces. Corrosion pits are holes that are relatively small in size [25,27] and can actively sustain capillarity [34]. Hence, formation of corrosion pits on surfaces during their long-term exposures to NaCl solution increases their surface wettability causing a reduction in their CA values and as a consequence their CR values increase (Figure 7).…”

Section: Corrosion Behaviourmentioning

confidence: 99%

Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water

Annakodi¹,

Singh

Jayalakshmi

et al. 2021

Metals

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The 304 Stainless Steel (SS304) is severely affected by salt water corrosion due to its high surface wettability. By reducing its surface wettability, its corrosion can be reduced. To achieve this, topographical modification of the steel surface is an effective route. In this work, SS304 flat surfaces were topographically modified into microgrooves (ridge width 250 μm to 500 μm, groove width 200 μm, width ratio = ridge width/groove width >1). Wire cut electrical discharge machining was used to fabricate the microgrooves. Long-term wetting characteristics and long-term corrosion behaviour of flat surface and microgrooves were studied. The influence of the nature of wetting of the tested surfaces on their corrosion behaviour was examined. The sessile drop method and potentiodynamic polarization tests in sodium chloride (3.5 wt. % NaCl) solution (intermittent and continuous exposures for 168 h) were studied to characterize their wetting and corrosion behaviours, respectively. Topographical modification imparted long-term hydrophobicity and, as a consequence, long-term anticorrosion ability of the steel surface. Micropatterning reduced the corrosion rate by two orders of magnitude due to reduction in interfacial contact area with the corrosive fluid via composite wetting, i.e., solid–liquid–air interface. Microgrooves showed corrosion inhibition efficiency ³88%, upon long-term exposure to NaCl solution. By comparing the wetting and corrosion behaviours of the microgrooves with those of the previously studied microgrooves (ridge width/groove width <1), it was found that the surface roughness of their ridges strongly influences their wetting and corrosion properties.

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Section: Corrosion Behaviourmentioning

confidence: 99%

Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water

Annakodi¹,

Singh

Jayalakshmi

et al. 2021

Metals

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“…The image analysis provides important information on the evaluation of morphological properties [27]. In this report, all images were collected from photomicrographs obtained from SEM, and the results were expressed as particle radius size, wich can have a directly correlation with mean particle size.…”

Section: Physical-chemical Characterization and Quality Control 373mentioning

confidence: 99%

Physical-chemical characterization and quality control of spironolactone raw material samples

et al. 2008

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It is well established that solid-state properties such as solubility, particle size, and morphology are critical factors in the development of pharmaceutical formulations. Thus, the evaluation of the physical-chemical properties of the substances that will be used must be the primary step for quality control in the pharmacy industry. The aim of this report is to characterize and to establish the quality of four spironolactone raw samples, derived from distinct laboratories, through thermal analysis (DSC and TG), infrared spectroscopy (IV), solubility assay, scanning electron microscopy, and digital image analysis. Capsules of spironolactone were also prepared with these different drug samples and dissolution profiles determined. The IR and the DSC assays confirmed the identity of the samples as spironolactone. Morphological differences relating to shape, size, and particle size distribution were found and can be directly related to the varied dissolution profiles presented by the different formulations.

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“…Their micromodel had a porosity >66% and had irregular pore geometry. Porous media with high porosities (40% to 98%) are found in many industrial applications such as metallic thin‐fiber material and metallic powder, which are used in the transportation industry [ Dubikovskaya et al , 1990], and in manufacturing capillary structures [ Reimbrecht et al , 2003]. Because of these special features of the micromodel, conventional pore network models with pore body and pore throat elements are not suitable.…”

Section: Introductionmentioning

confidence: 99%

Simulating drainage and imbibition experiments in a high‐porosity micromodel using an unstructured pore network model

Niasar

Hassanizadeh

Pyrak‐Nolte

et al. 2009

Water Resources Research

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[1] Development of pore network models based on detailed topological data of the pore space is essential for predicting multiphase flow in porous media. In this work, an unstructured pore network model has been developed to simulate a set of drainage and imbibition laboratory experiments performed on a two-dimensional micromodel. We used a pixel-based distance transform to determine medial pixels of the void domain of micromodel. This process provides an assembly of medial pixels with assigned local widths that simulates the topology of the porous medium. Using this pore network model, the capillary pressure-saturation and capillary pressure-interfacial area curves measured in the laboratory under static conditions were simulated. On the basis of several imbibition cycles, a surface of capillary pressure, saturation and interfacial area was produced. The pore network model was able to reproduce the distribution of the fluids as observed in the micromodel experiments. We have shown the utility of this simple pore network approach for capturing the topology and geometry of the micromodel pore structure.Citation: Joekar Niasar, V., S. M. Hassanizadeh, L. J. Pyrak-Nolte, and C. Berentsen (2009), Simulating drainage and imbibition experiments in a high-porosity micromodel using an unstructured pore network model, Water Resour. Res.,

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Manufacturing of metallic porous structures to be used in capillary pumping systems

Cited by 6 publications

References 5 publications

Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water

Anticorrosion Behaviour of SS304 Microgroove Surfaces in Saline Water

Physical-chemical characterization and quality control of spironolactone raw material samples

Simulating drainage and imbibition experiments in a high‐porosity micromodel using an unstructured pore network model

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