Effect of Variable Frequency Drive and Pipe Materials on Guava Juice Flow | ||||
| Arab Universities Journal of Agricultural Sciences | ||||
| Article 11, Volume 30, Issue 1, June 2022, Page 29-41 PDF (691.44 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ajs.2022.115676.1453 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Shereen Shalaby   1; Mubarak Mustafa1; Yahiya Heikal2; Mahmoud El Attar 1
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| 1Agricultural Engineering Department, Faculty of Agriculture, Ain Shams University, Cairo, Egypt | ||||
| 2Food Science Department, Faculty of Agriculture, Ain Shams University, Cairo, Egypt | ||||
| Abstract | ||||
| In this study, a designed variable frequency drive (VFD) was used to control a single-phase induction motor’s speed to pump guava juice at two solid concentrations (9°Bx and 11°Bx). Next, the pressure drop was measured in stainless-steel pipes of three diameters. The pressure drop percentage difference before and after using the VFD at varied flow rates with 10 repetitions at 5-minute intervals was evaluated. The pressure drop reduction range was 19.7%– 30.8% and 19.2 %–32.4% for the 9% and 11% solid concentrations respectively after using the VFD, which resulted in an average of 25.73% reductions in pressure drop and the pump’s total head and driving power. The rheological properties of guava juice were investigated at various temperatures (5, 15, 25, 35, 55 and 75°C). From the results, all materials exhibited non-Newtonian pseudoplastic behavior at all temperatures and concentrations, and correlated well with the power law model, with flow behavior index (n) values less than unity for the 9% and 11% solid concentrations. The findings offer helpful information for predicting how heat variations during processing influence the behavior of guava juice concentrates. | ||||
| Keywords | ||||
| Pressure drop; Pipe flow; Variable frequency drive; Reynolds number; Rheological prope | ||||
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