A review on thermo-physical properties of bio, non-bio and hybrid nanofluids

Abstract

The pressure drop and thermal performance of various nanofluids can be affected by their thermo-physical properties. However, there are many different parameters that need to be considered when determining the thermo-physical properties of nanofluids. This paper highlights a detail reviews on the thermo-physical properties of nanofluids with different material type and effect of some process parameters (such as material type, temperature and concentration) on the thermo-physical properties of nanofluids. Four thermo-physical properties mainly density, viscosity, thermal conductivity and specific heat capacity from different literatures were summarized, discussed and presented. The lowest viscosity value of nanofluids in literature was mango bark water-based nanofluid (0.81cP). On the other hand, the maximum thermal conductivity value of nanofluids in the literature was GNP-Ag water-based nanofluid (0.69W/mK). The density and specific heat capacity are strongly dependent on the material type. Meanwhile, the viscosity and thermal conductivity are greatly affected by temperature and concentration. The most influential parameters on thermo-physical properties of nanofluids are material type followed by temperature. Most of the literatures confirmed bio nanofluids have low viscosity value and hybrid have high thermal conductivity values.

Numerical Investigation of Heat Transfer and Pressure Drop Characteristics of Mango Bark-CO2 Nanofluid in inclined Gas Cooling Process

“…𝜌 𝑛𝑓 = 𝜑 𝜌 𝑝 + (1 − 𝜑)𝜌 𝑓 (10) Where 𝜌 𝑛𝑓 , 𝜌 𝑝 , 𝜌 𝑓 and 𝜑 are the densities of the nanofluids, nanoparticles, base fluid, and volume fraction, respectively.…”

“…Sharifpur et al [9] also investigated the thermal conductivity of water and mango bark/water nanofluid at varying concentrations (0.1 percent, 0.5 percent, and 1.0 percent) and temperatures between 10 o C and 40 o C. Compared to water, the mango bark/water nanofluid had no appreciable thermal conductivity increase. Chen et al [10] showed that palm kernel/water-EG and mango/water nanofluids had relatively low thermal conductivities compared to non-bio nanofluids and that hybrid non-bio nanofluids had the highest thermal conductivity for low nanoparticle concentration of 0.1%.…”

Preparation and Properties of ZrO2/SiC-H2O Nanofluids to Use for Energy Storage Application

“…Organic particles, such as those manufactured from rice husk or wood, on the other hand, have a lower density and a lower heat conductivity than traditional HTFs. Therefore, the concept of attempting to improve the thermal conductivity of nanofluids by adding metallic particles and reducing the viscosity of traditional HTFs by adding organic particles is an innovative one [11][12][13][14][15][16].…”