Effect of fabrication parameters on thermophysical properties of sintered wicks
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2012
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| Online Access: | http://hdl.handle.net/1721.1/68940 |
| _version_ | 1811097783105486848 |
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| author | Domínguez Espinosa, Francisco Alonso |
| author2 | John G. Brisson. |
| author_facet | John G. Brisson. Domínguez Espinosa, Francisco Alonso |
| author_sort | Domínguez Espinosa, Francisco Alonso |
| collection | MIT |
| description | Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011. |
| first_indexed | 2024-09-23T17:04:52Z |
| format | Thesis |
| id | mit-1721.1/68940 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T17:04:52Z |
| publishDate | 2012 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/689402019-04-11T01:15:24Z Effect of fabrication parameters on thermophysical properties of sintered wicks Domínguez Espinosa, Francisco Alonso John G. Brisson. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Mechanical Engineering. Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011. Cataloged from PDF version of thesis. Includes bibliographical references (p. 134-140). Porous wicks for use in a loop heat pipe were sintered from copper and Monel powder. These wicks were characterized in terms of their shrinkage, porosity, thermal conductivity, liquid permeability and maximum capillary pressure. The effect of fabrication parameters (particle size and sintering conditions) on these properties was studied. Shrinkage was found to increase with increasing sintering time and temperature. Porosity followed the opposite trend. For a given sintering temperature, thermal conductivity of the samples was found to increase as the sintering time increased. Permeability and capillary pressure were found to be independent of the sintering time as long as the wick stayed bonded to the walls of its container. In addition to measuring the properties of the wicks, a model for predicting their thermal conductivity was developed. First, the so-called 'two-sphere model' is used to relate the sintering conditions to the size of the connections between particles (referred as 'necks'). Then, a finite element simulation was used to determine the thermal resistance of diverse unit cells as a function of the neck size between the particles. Finally a MATLAB simulation program was written to generate a random 3D resistor network as means to model the multiple connections between spheres in a wick. The MATLAB code was used to calculate the effective thermal conductivity of the wick. Comparison of the model predictions with the experimental data showed good agreement. by Francisco Alonso Dominguez Espinosa. S.M. 2012-01-30T17:04:42Z 2012-01-30T17:04:42Z 2011 2011 Thesis http://hdl.handle.net/1721.1/68940 773749268 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 140 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Mechanical Engineering. Domínguez Espinosa, Francisco Alonso Effect of fabrication parameters on thermophysical properties of sintered wicks |
| title | Effect of fabrication parameters on thermophysical properties of sintered wicks |
| title_full | Effect of fabrication parameters on thermophysical properties of sintered wicks |
| title_fullStr | Effect of fabrication parameters on thermophysical properties of sintered wicks |
| title_full_unstemmed | Effect of fabrication parameters on thermophysical properties of sintered wicks |
| title_short | Effect of fabrication parameters on thermophysical properties of sintered wicks |
| title_sort | effect of fabrication parameters on thermophysical properties of sintered wicks |
| topic | Mechanical Engineering. |
| url | http://hdl.handle.net/1721.1/68940 |
| work_keys_str_mv | AT dominguezespinosafranciscoalonso effectoffabricationparametersonthermophysicalpropertiesofsinteredwicks |