Selected physical properties of various diesel blends

Abstract

A b s t r a c t. The quality determination of biofuels requires identifying the chemical and physical parameters. The key physical parameters are rheological, thermal and electrical properties. In our study, we investigated samples of diesel blends with rapeseed methyl esters content in the range from 3 to 100%. In these, we measured basic thermophysical properties, including thermal conductivity and thermal diffusivity, using two different transient methods -the hot-wire method and the dynamic plane source. Every thermophysical parameter was measured 100 times using both methods for all samples. Dynamic viscosity was measured during the heating process under the temperature range 20-80°C. A digital rotational viscometer (Brookfield DV 2T) was used for dynamic viscosity detection. Electrical conductivity was measured using digital conductivity meter (Model 1152) in a temperature range from -5 to 30°C. The highest values of thermal parameters were reached in the diesel sample with the highest biofuel content. The dynamic viscosity of samples increased with higher concentration of bio-component rapeseed methyl esters. The electrical conductivity of blends also increased with rapeseed methyl esters content.K e y w o r d s: diesel blends, rapeseed methyl ester, thermophysical, rheological and electrical properties INTRODUCTION

Spruce pellets in compression loading

“…The dependencies between the dynamic viscosity and temperature of two bio-oils (Plahyd N and Plahyd S) were determined, indicating an exponentially decreasing trend. Hlaváčová et al (2018) confirmed that rheological data are important for product quality evaluation, engineering calculations and process design. The knowledge and understanding of material behaviour is crucially important for determining the size and energy requirements of the material.…”

Mechanical properties of buckwheat perga

“…They studied the dynamic viscosity-temperature dependence of two bio-oil types (namely Plahyd N and Plahyd S) and recorded exponentially decresing trends. Hlaváčová et al (2018) argue that rheological data are important for product quality evaluation, engineering calculations and process design. It is necessary to know and understand the behaviour of different materials to determine the size and energy requirements of associated equipment and production processes.…”