Preparation and thermophysical properties of nanoparticle-in-paraffin emulsion as phase change material

Abstract In this study, phase change material (PCM) embedded by nanoparticles was prepared by emulsifying alumina (Al 2 O 3 ) nanoparticles in paraffin (n-octadecane) by means of a non-ionic surfactant. The formulated nanoparticle-in-paraffin emulsions contain the nanoparticles of 5 wt.% and 10 wt.%, respectively; their effective thermophysical properties, such as latent heat of fusion, density, dynamic viscosity, and thermal conductivity, were investigated experimentally. The experimentally measured density of the emulsions agrees excellently with that predicted based on the mixture theory. The measured thermal conductivity and dynamic viscosity for the nanoparticle-in-paraffin emulsions formulated show a nonlinear increase with the mass fraction of the nanoparticles compared with that for the pure paraffin, depending on the temperature.

[1]  U. Stritih.  An experimental study of enhanced heat transfer in rectangular PCM thermal storage , 2004 .

[2]  R. Viskanta,et al.  Inward solid-liquid phase-change heat transfer in a rectangular cavity with conducting vertical walls , 1984 .

[3]  Kai Sirén,et al.  Approximate analytical model for solidification in a finite PCM storage with internal fins , 2003 .

[4]  Yogendra Joshi,et al.  Application of Phase Change Materials to Thermal Control of Electronic Modules: A Computational Study , 1997 .

[5]  G. Ziskind,et al.  Numerical investigation of a PCM-based heat sink with internal fins , 2005 .

[6]  A. Sari,et al.  Thermal conductivity and latent heat thermal energy storage characteristics of paraffin/expanded graphite composite as phase change material , 2007 .

[7]  W. Humphries,et al.  A design handbook for phase change thermal control and energy storage devices. [selected paraffins] , 1977 .

[8]  M. Gharebaghi,et al.  Enhancement of Heat Transfer in Latent Heat Storage Modules with Internal Fins , 2007 .

[9]  A. A. Kudirka,et al.  Avionics Passive Cooling With Microencapsulated Phase Change Materials , 1998 .

[10]  Salvatore Vasta,et al.  Thermal conductivity measurement of a PCM based storage system containing carbon fibers , 2005 .

[11]  V. Sartre,et al.  Transient state study of electric motor heating and phase change solid-liquid cooling , 1997 .

[12]  Stephen U. S. Choi,et al.  Effects of Various Parameters on Nanofluid Thermal Conductivity , 2007 .

[13]  Ching-Jenq Ho,et al.  Numerical simulation of natural convection of nanofluid in a square enclosure: Effects due to uncertainties of viscosity and thermal conductivity , 2008 .

[14]  I. Alatiqi,et al.  Heat transfer enhancement by metal screens and metal spheres in phase change energy storage systems , 2004 .

[15]  Jamil A. Khan,et al.  ENHANCEMENT OF HEAT TRANSFER BY INSERTING A METAL MATRIX INTO A PHASE CHANGE MATERIAL , 1996 .

[16]  Ibrahim Dincer,et al.  Thermal Energy Storage , 2004 .

[17]  C. Chu,et al.  Thermal protection characteristics of a vertical rectangular cell filled with PCM/air layer , 1996 .

[18]  S. Phillpot,et al.  THERMAL TRANSPORT IN NANOFLUIDS1 , 2004 .

[19]  Tian Jian Lu,et al.  Thermal management of high power electronics with phase change cooling , 2000 .

[20]  Luisa F. Cabeza,et al.  Review on thermal energy storage with phase change: materials, heat transfer analysis and applications , 2003 .

[21]  K. Ismail,et al.  Numerical and experimental study on the solidification of PCM around a vertical axially finned isothermal cylinder , 2001 .

[22]  J. Fukai,et al.  Effect of carbon-fiber brushes on conductive heat transfer in phase change materials , 2002 .

[23]  R. Velraj,et al.  Heat transfer enhancement in a latent heat storage system , 1999 .

[24]  E. Mettawee,et al.  Thermal conductivity enhancement in a latent heat storage system , 2007 .

[25]  X. Py,et al.  Paraffin/porous-graphite-matrix composite as a high and constant power thermal storage material , 2001 .

[26]  A. Faghri,et al.  Thermal protection from intense localized moving heat fluxes using phase-change materials , 1990 .

[27]  Z. Zhang,et al.  Study of a PCM based energy storage system containing Ag nanoparticles , 2007 .