Thermal energy storage behavior of Al2O3–H2O nanofluids

Effect of γ-Fe2O3 nanoparticles on rheological and volumetric properties of solutions containing polyethylene glycol

“…1a were overlapped with adding the PEG2000 and also PEG6000 to the nanofluid of c-Fe 2 O 3 -PEG400. Figure 1b- [25]. Therefore, in our work, the stability of the studied c-Fe 2 O 3 nanofluids is good.…”

“…The obtained particle sizes for c-Fe 2 O 3 nanoparticles in nanofluids of cFe 2 O 3 -PEG400 and c-Fe 2 O 3 -PEG400-PEG6000 are much larger than 80 Å ; thereby, the blue shift of maximum absorption wavelength of UV-Vis cannot be due to the quantum effects. As we know, the optical properties of nanostructures depend on their shapes, sizes and the surrounding environment [24][25][26]. In this work, the preparation conditions are same for bulk-Fe 2 O 3 -PEG400 fluid and c-Fe 2 O 3 -PEG400 nanofluid; the two main differences are the particle size of Fe 2 O 3 in these fluids and interaction of PEG with the surface of c-Fe 2 O 3 nanoparticles which can be higher than the surface of bulk-Fe 2 O 3 .…”

Study on the Phase Change Characteristics of Carbon-Based Nanofluids

“…(1) Adding SDBS and MCMs to water reduced the θ of the water between the sample and the substrate (increasing the wettability of the interface) and contribute to freezing nucleation [6,12,35,36].…”

“…To avoid the aforementioned factors negatively affecting the nucleation rate and SD, researchers have proposed several methods such as adding nucleating agents or undissolved impurities [6][7][8][9][10][11][12], changing the size and shape of the PCMs [13][14][15], inputting external energy (mechanical and ultrasonic vibration) [16,17], increasing the thermal conductivity of the PCMs [18][19][20], reducing the kinematic viscosity of the PCM [20][21][22][23], encapsulating the PCMs [24], and using the porous structure and network of the PCM to enhance their energy storage performance [25,26]. Such methods can effectively suppress SD and improve the energy storage performance of PCMs.…”

Melting of Nanoprticle-Enhanced Phase Change Material inside Shell and Tube Heat Exchanger

“…They concluded that Cu nanoparticles have the best performance for heat transfer. Wu et al [16] In the present study, the solidification behavior of the NEPCM and the effect of various volume fractions of nanoparticles (0, 0.03, and 0.05) on melting rate in a cylindrical shell container are numerically studied. Figure 1 presents the schematic of the physical model.…”