Volume 3, Issue 4 (2001)
JAST 2001, 3(4): 257-264 |
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Rajabipour A, Shahbazi F, Mohtasebi S, Tabatabaifar A. Airflow Resistance in Walnuts. JAST 2001; 3 (4) :257-264
URL: http://jast.modares.ac.ir/article-23-2733-en.html
URL: http://jast.modares.ac.ir/article-23-2733-en.html
1- Agricultural Machinery Department, University of Tehran, Karaj, Islamic Republic of Iran,
2- Department of Agricultural Machinery, College of Agriculture, University of Lurestan, Khoramabad, Islamic Republic of Iran.
2- Department of Agricultural Machinery, College of Agriculture, University of Lurestan, Khoramabad, Islamic Republic of Iran.
Abstract: (8372 Views)
The harvested walnut has a relatively high moisture content of 30% compared with the
safe storage moisture content of 8%. One of the common means of reducing the moisture
content is by drying. For design of drying and other aeration systems for agricultural
products including walnuts, the relationship between the drop in pressure and airflow velocity
must be known. An airflow resistance apparatus was designed and manufatured to
measure the airflow resistance of walnuts. This apparatus consisted of an air compressor,
a rotameter, a cylindrical bin and an inclined U-tube manometer. The pressure, drops at
airflow velocities of 0.085 to 0.55 (m3/s)/m2, were measured at a constant depth of the nuts.
Airflow resistance equations were fitted to the measured data. The results showed that, by
increasing airflow rates, an increased drop in pressure was achieved through out walnut
column. To study the effect of walnut moisture content on airflow resistance, the drop in
pressure was measured at different moisture contents levels of 8.6%, 15.5%, 21.3% and
27%. Results indicated that the drop in pressure decreased with increasing moisture content,
especially for high airflow rates.
Subject:
Agricultural Machinery
Received: 2010/05/16 | Accepted: 2010/05/16 | Published: 2010/05/16
Received: 2010/05/16 | Accepted: 2010/05/16 | Published: 2010/05/16
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