| Author | Muthukumarappan, Kasiviswanathan |
| Call Number | AIT Thesis no.AE-88-19 |
| Subject(s) | Rice processing
|
| Note | A Thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The quantification of volume change during moisture adsorption and
desorption in rice kernels is essential for ascertaining the reasons for
low head rice yield and/or crack development. In this study three forms
of rice grain, namely rough, brown and milled rice were considered for
monitoring the change in t heir volume due to moisture and temperature.
The volume measurements due to moisture changes in rice were based on the
water displacement method, air comparison pycnometer and a commercial
pycnometer. It was necessary to construct special dilatometers for the
measurement of a very small change in volume of rice kernels due to
temperature change. In addition, the coefficients of linear hygroscopic
expansion were determined by measuring the linear changes in dimensions
of the various grain types at different moisture contents both under
adsorption and desorption cycles.
The change in volume of rough rice with moisture content was best
related by a quadratic equation whereas brown and milled rice followed
linear relationships. The coefficient of linear hygroscopic expansion of
thickness was higher than that of length and width for all forms of rice
grain considered in this study.
The coefficient of linear and cubical hygroscopic expansion of brown
rice was higher than that of rough and milled rice. However, the
coefficient of cubical thermal expansion of rough and brown rice were
lower than that of milled rice. It was shown that t he results of this
study could be used for estimating the volume changes in rough rice with
exposure time during moisture adsorption in conjunction with the previous
findings. |
| Year | 1988 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Jindal, Vinod Kumar |
| Examination Committee(s) | Illangantileke, Sarath G. ;Athapol Noomhorm |
| Scholarship Donor(s) | Government of Netherlands |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1988 |