| Author | Akhtar, Javed |
| Call Number | AIT Thesis no.AE-78-05 |
| Subject(s) | Cassava--Drying
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources & Development |
| Publisher | Asian Institute of Technology |
| Abstract | Drying characteristics of cassava chips with heated air were studied. The effects of air temperature, air flow rate and tray loading were experimentally investigated on two different chip sizes with a laboratory drier. Experimental conditions included four air temperatures 80, 100, 120 and 140 deg. F., three air flow rates 44, 88 and 132 cfm/ft2 and three tray loadings 0.939, 1.878 and 2.817 £b/ft2. The relative humidity of the air was not controlled.
An increase in air temperature or air flow rate increased the corresponding drying rates for both chip sizes. An increase in tray loading or chip size decreased the drying rates.
An attempt was made to predict drying in a deep bed of cassava chips using the developed thin layer drying equation. The deep bed was considered to be made of a number of thin layers stacked one upon another. The drying rates in deep bed were computed using the conventional grain drying simulation approach as proposed by THOMPSON (1968). The predicted drying rates by the THOMPSON's model were much faster than the experimental drying rates.
The possible reason appeared to be the higher air temperatures in between the layers being computed in the simulation scheme. This was verified by
comparing the experimentally observed and the predicted air temperatures which differed substantially. An empirical procedure was developed to predict drying in deep beds
based on experimental results. The projected drying rates based on thin layer drying equation and the experimentally observed drying rates were related by using an adjustment factor alpha. This factor was evaluated and expressed as a function of tray loading at two different drying air temperatures of 115 and 130 deg.F. Then, it was possible to predict drying history
at any point in a deep bed of cassava chips upto 7 in.reasonably. |
| Year | 1978 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Jindal, Vinod Kumar
|
| Examination Committee(s) | Singh, Gajendra ; Nguyen, Cong Thanh
|
| Scholarship Donor(s) | Government of Canada |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1978 |