Thermal characterization of castor oil as additive in lubricant oil using photothermal techniques

G Lara-Hernandez,J.C Benavides-Parra,E Contreras-Gallegos,Alfredo Cruz-Orea,C Hernández-Aguilar,Agustin Jose De Jesus Flores Cuautle

doi:10.47566/2018_syv31_1-010006

Abstract

Over the last years extensively research has been carried out on full or partial substitution of supplies resources coming from renewable resources on traditionally non-renewable, in the case of the automobile sector there are progresses in bio-combustibles (biofuel) and synthetic oils coming from vegetable sources. There are strong efforts to find oil additives which can improve oils features in automobile industry, by adding vegetables oils to commercial lubricant oils, is expected to improve oil thermal stability. In the present research, different ratios of castor oil (ricinus comunis)-motor oil blends were obtained and their thermal properties were characterized by using the so-called Back and Front Photopyroelectric (BPPE/FPPE) techniques. Several oil-additives concentrations were measured and thermal diffusivities and effusivities as well as densities are reported, getting full thermal characterization for every concentration.

Highlights

Experimental detailsThe awareness of pollution, scarce of fossil fuels and the environmental footprint, are rising and they are subject of important research around the world, regarding fuels there is an important concern about the development of ecological friendly combustibles and two main research lines have been developed, the first one is the introduction of the so-called biodiesel, and the second one is the improvement of the existing fuels [1,2,3,4,5].Regarding fuels, vegetable oils had appeared as the option of choice, as biodiesel source and as additives in the fossil fuels
For castor oil- SAE40W oil blends in the 0 to 20 % range castor oil content, thermal effusivity behavior is showed in Figure 3, black squares represent the obtained experimental values, with the respectively confidence interval (± 15 Ws1⁄2m−2k−1), the solid curve is a fit with an exponential function, representing the exponential like behavior of the thermal effusivity as function of castor oil concentration
As it can be seen between 10% and 15% of castor oil content, the SAE 40W thermal diffusivity values decreased from 8.9 m2s−1, value close to the sesame oil or grape seed oil [25, 26], to 8.2 m2s−1 this is a reduction of around 8% of the initial value

Summary

Introduction

Experimental detailsThe awareness of pollution, scarce of fossil fuels and the environmental footprint, are rising and they are subject of important research around the world, regarding fuels there is an important concern about the development of ecological friendly combustibles and two main research lines have been developed, the first one is the introduction of the so-called biodiesel, and the second one is the improvement of the existing fuels [1,2,3,4,5].Regarding fuels, vegetable oils had appeared as the option of choice, as biodiesel source and as additives in the fossil fuels. © Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales where A is an instrumental factor, ηs is the nonradiative conversion efficiency for the absorbing sample, κp is the thermal conductivity of the pyroelectric sensor, bsp = es/ep, with ej the thermal effusivity of the j-th element in the PE cell and ω0 the angular frequency of the laser beam (ω0 = 2πf).

Results

Conclusion