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Experimental Investigation of Melting of Two Immiscible Phase Change Material

Momeni, Meisam | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50706 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Behshad Shafii, Mohammad
  7. Abstract:
  8. Heat transfer associated with phase change occurs in many physical phenomena. One of the ways of thermal energy storage is the use of latent heat phase change. Therefore, it is important to know the thermal performance of phase change material. In this research, the aim is to investigate the process of phase change of a system consists of two immiscible phase change materials and the comparison of this system with a system consists of one phase change material. The experiments with the two materials system is conducted in two ways. In the first state, that is the normal state, denser material is placed in the bottom and in the second state, denser material is placed in the top. Constant heat flux is applied from the bottom of the rectangular enclosure. In the experiments, two types of materials is used. The first type includes water and oleic acid and the second type includes Calcium Chloride hexahydrate and coconut oil. The basic difference of these two types is that for the first type, the material with lower melting point is denser but for the second type this is true conversely. In the experiments of the first type of materials, it is seen that for the unusual case, temperature of heater surface decreases when water begins to melt. The reason is the lower melting point of water compare to oleic acid. But in the case of the second types of materials, after the ending of the process of coconut oil melting, temperature of heater surface increases drastically. The reason is that the liquid zone is converted to two zones and also the melting point of Calcium Chloride hexahydrate is higher than the melting point of oil coconut
  9. Keywords:
  10. Phase Change Material (PCMs) ; Melting ; Immiscible Fluid ; Constant Heat Flux ; Rectangular Enclosure

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