Heat Transfer Performance Potential with a High-Temperature Phase Change Dispersion

Phase change dispersions are useful for isothermal cooling applications. As a result of the phase changes that occur in PCDs, they are expected to have greater storage capacities than those of single-phase heat transfer fluids. However, for appropriate heat exchanger dimensions and geometries for us...

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Bibliographic Details
Published inEnergies (Basel) Vol. 14; no. 16; p. 4899
Main Authors Fischer, Ludger, Mura, Ernesto, O’Neill, Poppy, von Arx, Silvan, Worlitschek, Jörg, Qiao, Geng, Li, Qi, Ding, Yulong
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.08.2021
Subjects
Boundary conditions
Convective heat transfer
Dispersions
Experimentation
Fatty acids
Flow rates
Fluid dynamics
Fluid flow
Heat flux
Heat storage
Heat transfer
Heat transfer coefficients
High temperature
Low temperature
Mass flow rate
Nusselt number
Particle size
Phase change
phase change slurry
Reynolds number
Surfactants
Temperature
temperature control
Temperature gradients
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Summary:Phase change dispersions are useful for isothermal cooling applications. As a result of the phase changes that occur in PCDs, they are expected to have greater storage capacities than those of single-phase heat transfer fluids. However, for appropriate heat exchanger dimensions and geometries for use in phase change dispersions, knowledge about the convective heat transfer coefficients of phase change dispersions is necessary. A test unit for measuring the local heat transfer coefficients and Nusselt numbers of PCDs was created. The boundary condition of constant heat flux was chosen for testing, and the experimental heat transfer coefficients and Nusselt numbers for the investigated phase change dispersion were established. Different experimental parameters, such as the electrical wall heat input, Reynolds number, and mass flow rate, were varied during testing, and the results were compared to those of water tests. It was found that, due to the tendency of low-temperature increases in phase change dispersions, the driving temperature difference is greater than that of water. In addition, larger heat storage capacities were obtained for phase change dispersions than for water. Through this experimentation, it was acknowledged that future investigation into the optimised operating conditions must be performed.
ISSN:1996-1073
1996-1073
DOI:10.3390/en14164899