Effect of processing parameters on the properties of freeze-cast Ni wick with gradient porosity
Wicks are the main component of Loop Heat Pipe systems, whereby coolant liquid flow through their porous structure. They are usually formed by a primary wick to produce liquid transportation by capillary force, and a secondary wick that is continuously wetted by the liquid coolant. Traditionally, th...
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| Format: | Article |
| Language: | English |
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Elsevier
2021-08-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127521003488 |
| _version_ | 1818741640589737984 |
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| author | P.J. Lloreda-Jurado E. Chicardi A. Paúl R. Sepúlveda |
| author_facet | P.J. Lloreda-Jurado E. Chicardi A. Paúl R. Sepúlveda |
| author_sort | P.J. Lloreda-Jurado |
| collection | DOAJ |
| description | Wicks are the main component of Loop Heat Pipe systems, whereby coolant liquid flow through their porous structure. They are usually formed by a primary wick to produce liquid transportation by capillary force, and a secondary wick that is continuously wetted by the liquid coolant. Traditionally, the two wicks are manufactured separately and subsequently joined, thereby creating an interface that reduces the liquid transfer efficiency. In order to overcome this situation, a gradient porous wick is proposed and successfully manufactured through the freeze-casting method in a single operation. The influence of two different dispersant agents, KD4® and stearic acid was studied on the processing parameters, final pore size and morphology, and capillarity performances. A variate of gradient porosity was obtained by applying a diverse thermal gradient and solidification front velocity during directional solidification. The rheological characterisation of the camphene-based NiO suspensions was performed using a rotational viscometer. The final pore size and morphology were characterised by Optical Microscopy, Field Emission Scanning Electron Microscopy, and X-ray computed tomography. The use of stearic acid improves the particle stabilisation and generates pore enlargement with an equiaxed pore structure, while commercial dispersant KD4® shows a dendritic pore morphology at lower thermal gradient. |
| first_indexed | 2024-12-18T01:59:50Z |
| format | Article |
| id | doaj.art-acb84d03c8584a03aac43bc4d0557c87 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-18T01:59:50Z |
| publishDate | 2021-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-acb84d03c8584a03aac43bc4d0557c872022-12-21T21:24:47ZengElsevierMaterials & Design0264-12752021-08-01206109795Effect of processing parameters on the properties of freeze-cast Ni wick with gradient porosityP.J. Lloreda-Jurado0E. Chicardi1A. Paúl2R. Sepúlveda3Departamento de Ingeniería y Ciencia de los Materiales y del Transporte, E.T.S. de Ingenieros, Universidad de Sevilla, Avda. Camino de los Descubrimientos s/n., 41092 Sevilla, SpainDepartamento de Ingeniería y Ciencia de los Materiales y del Transporte, E.T.S. de Ingenieros, Universidad de Sevilla, Avda. Camino de los Descubrimientos s/n., 41092 Sevilla, SpainDepartamento de Ingeniería y Ciencia de los Materiales y del Transporte, E.T.S. de Ingenieros, Universidad de Sevilla, Avda. Camino de los Descubrimientos s/n., 41092 Sevilla, SpainCorresponding author.; Departamento de Ingeniería y Ciencia de los Materiales y del Transporte, E.T.S. de Ingenieros, Universidad de Sevilla, Avda. Camino de los Descubrimientos s/n., 41092 Sevilla, SpainWicks are the main component of Loop Heat Pipe systems, whereby coolant liquid flow through their porous structure. They are usually formed by a primary wick to produce liquid transportation by capillary force, and a secondary wick that is continuously wetted by the liquid coolant. Traditionally, the two wicks are manufactured separately and subsequently joined, thereby creating an interface that reduces the liquid transfer efficiency. In order to overcome this situation, a gradient porous wick is proposed and successfully manufactured through the freeze-casting method in a single operation. The influence of two different dispersant agents, KD4® and stearic acid was studied on the processing parameters, final pore size and morphology, and capillarity performances. A variate of gradient porosity was obtained by applying a diverse thermal gradient and solidification front velocity during directional solidification. The rheological characterisation of the camphene-based NiO suspensions was performed using a rotational viscometer. The final pore size and morphology were characterised by Optical Microscopy, Field Emission Scanning Electron Microscopy, and X-ray computed tomography. The use of stearic acid improves the particle stabilisation and generates pore enlargement with an equiaxed pore structure, while commercial dispersant KD4® shows a dendritic pore morphology at lower thermal gradient.http://www.sciencedirect.com/science/article/pii/S0264127521003488Freeze-castingNickelWickCampheneStearic acidNanoparticles |
| spellingShingle | P.J. Lloreda-Jurado E. Chicardi A. Paúl R. Sepúlveda Effect of processing parameters on the properties of freeze-cast Ni wick with gradient porosity Materials & Design Freeze-casting Nickel Wick Camphene Stearic acid Nanoparticles |
| title | Effect of processing parameters on the properties of freeze-cast Ni wick with gradient porosity |
| title_full | Effect of processing parameters on the properties of freeze-cast Ni wick with gradient porosity |
| title_fullStr | Effect of processing parameters on the properties of freeze-cast Ni wick with gradient porosity |
| title_full_unstemmed | Effect of processing parameters on the properties of freeze-cast Ni wick with gradient porosity |
| title_short | Effect of processing parameters on the properties of freeze-cast Ni wick with gradient porosity |
| title_sort | effect of processing parameters on the properties of freeze cast ni wick with gradient porosity |
| topic | Freeze-casting Nickel Wick Camphene Stearic acid Nanoparticles |
| url | http://www.sciencedirect.com/science/article/pii/S0264127521003488 |
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