Experimental investigation on thermophysical properties of iobiofluids

Abstract

The aim of this research was to investigate the density, thermal conductivity, and viscosity of dispersions of agricultural biomass particles in ionic liquid [HMIM][NTf2] used as a base fluid. This research is a continuation of the development of IoBioFluids, a new class of dispersions obtained by suspending particles produced from agricultural biomass, as a sustainable alternative to IoNanoFluids. Dispersions with different mass concentration of particles (0, 0.5, 1, 2.5, and 5 wt%) were studied at different temperatures (20°C, 30°C, 40°C, and 50°C). Agricultural biomass, namely sunflower stalks, was used for particle production. The dispersion was prepared by applying the commonly used two-step method. In the first step, particles were produced as dry powder from hydrothermal carbonization and heat treatment in the inert atmosphere oven. In the second step, the particles were dispersed into ionic liquid. A rheological investigation showed that dispersions exhibited Newtonian behavior for shear rates over 10 s−1. Density, thermal conductivity, and dynamic viscosity of dispersions increased with greater mass concentration of particles. Two applied merit criteria suggested a lack of any currently benefit of using the dispersions for heat transfer in the laminar flow regime due to high viscosity of dispersion. The results of criterial analysis showed that experimental data are relatively close to the limit values. Indications are suggesting the possibility of further improvement of IoBioFluid properties as a new heat transfer fluid.

An evaluation of the fundamental factors influencing the characteristics of mycelium-based materials: A review

“…There are various Journal on Processing and Energy in Agriculture 28 (2024) 1 applications of agricultural waste. The agricultural waste can be used for biogas generation (Al Afif et al, 2023), production of material called biochar wich has similar properties as coal (Pavkov et al, 2022), production of particles suspended in biofluids (Bikić et al, 2022;Radojčin et al, 2022) etc.…”

Special Collection on advanced practices in aerospace and energy engineering

“…On the other hand, this collection also addresses multiphase flows. Density, thermal conductivity, and viscosity of dispersions of agricultural biomass particles in ionic liquid are experimentally investigated in Radojcˇin et al 11 Dispersions with different mass concentration of particles were studied at different temperatures to investigate the possibility of creating a new, enhanced heat transfer fluid. Continuing onto novel structural materials, research presented in Vorkapic´et al 12 investigates the possibilities of enhancing mechanical properties of 3D printed thermoplastic polymers.…”