ENVIRONMENT-CONTROLLED THIN-LAYER-DRYING OF CUT-ROSELLE: DRYING-EXPERIMENTS, EFFECTS OF DRYING-SETTINGS, DRYING-MODELS

I.E. Saeed () and Zulkhairi Zainol Abidin
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I.E. Saeed: Department of Mech. & Manufacturing Eng., Faculty of Eng. & Built Environ., National University of Malaysia, 43600 Bangi
Zulkhairi Zainol Abidin: Department of Mech. & Manufacturing Eng., Faculty of Eng. & Built Environ., National University of Malaysia, 43600 Bangi

Acta Mechanica Malaysia (AMM), 2024, vol. 7, issue 1, 49-59

Abstract: This research investigated how the drying-conditions affect drying-performance of Cut-Roselle (Hibiscus_sabdariffa L.). The experiments are conducted using Constant-Temperature-Humidity-Chamber, where varied temperatures (35,45,55,65°C) and relative humidity levels (30,35,40,45,50%) are tested. The drying process for Cut-Roselle primarily occurred during the falling-rate-period. Notably, the drying-air temperature significantly, influenced the drying-kinetics, with higher temperatures (ranging from 35 to 65°C) resulted in shorter drying-times. Relative-humidity had a lesser-impact compared to the temperature. Extended drying-periods and increased equilibrium moisture levels are observed under conditions of elevated relative-humidity and reduced temperatures. An evaluation of various thin-layer drying-models is conducted to determine the most accurate model for the drying-characteristics. The Modified-Page II model demonstrated exceptional fit quality, with R2=0.99949. It effectively described the dehydration-behavior of Cut-Roselle within the range of the experimental drying-parameters.

Keywords: Cut-Roselle; thin-layer drying; controlled-drying; mathematical-models (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:zib:zbnamm:v:7:y:2024:i:1:p:49-59

DOI: 10.26480/amm.01.2024.49.59

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