Abstract
The purpose of this work is to study the characteristics and performance
of pine oil and its ester as a base fluid material for electrorheological
fluids.Here, all the tested fluids had a relatively low concentration level of
between 5-15% of weight.As an application for rotary machines, the
electrorheological strength and phenomena were studied for keeping the working
fluid in a steady position while the machine is not working.The objective of
this basic study is to give an introduction to the electrorheological fluids
based on polyaniline particles and pine oil and to measure their dependencies
on changes in the applied external electric field, temperature, shear rate,
dynamc viscosity and concentration, and to study the influence of grinding the
particles.Based upon the results of the investigations, the following can be
concluded in the case of electrorheological fluids made of polyaniline and
pine oil or its ester, treated with hexane, at temperatures between 20-60oC,
shear rate 40-490 1/min, electric field strength 0.5-3.5 kV/mm: 1.An increase
in electric field through the fluid increases the electrorheological strength
of the fluid if the concentration level is more than 5 % of weight.2.If the
fluid's concentration is 5 % of weight or less, the fluid does not express
electrorheological phenomena.3.In similar conditions, temperature has no or
very little effect on the electrorheological phenomena.4.The relative change
in shear rate has only a small effect on the electrorheological effectiveness
of the fluid if the concentration is 15 % of weight or less.5.Grinding
decreases the electrorheological strength of the electrorheological fluids
based on pine oils.6.The pine oil ester is more effective as a base oil for an
electrorheological fluid if the effectiveness is measured purely on the basis
of maximum shear strength versus shear rate.7.The basic idea of making an ER
fluid non-hydrous and with a low concentration level was found successful, an
average of over 20% increase in viscosity with a sufficient basic level of
viscosity, especially if the particle concentration was 10% of weight or above
and if pine oil ester was used as the carrier fluid.
| Original language | English |
|---|---|
| Qualification | Doctor Degree |
| Awarding Institution |
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| Supervisors/Advisors |
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| Award date | 21 May 1999 |
| Place of Publication | Espoo |
| Publisher | |
| Print ISBNs | 951-38-5373-X |
| Electronic ISBNs | 951-38-5374-8 |
| Publication status | Published - 1999 |
| MoE publication type | G4 Doctoral dissertation (monograph) |
Keywords
- electrorheological fluids
- rheology
- pine oil
- characterization
- viscosity
- test methods