Drying of Electrohydrodynamic (Ehd) on Potato Slices (Solanum Tuberosum) with Electrode Distance Variation

This research is about the use of electrohydrodynamics (EHD) on potato slices. The purpose of this study was to circumvent potato slices by comparing the results of variations in distance between the two electrodes. EHD generation is carried out using two types of electrode geometries, namely the needle electrode and the concentric ring electrode. Needle electrodes as cathodes and field electrodes or concentric rings as anode electrodes. The two electrodes are 10 x 10 pieces each. Drying the potato slices is carried out by placing it in a sample location parallel to the concentric ring electrode. Drying with EHD in atmospheric conditions will produce a current when given the added voltage measured on an digital multimeter. Electrode distance variations are 4 mm, 6 mm, 8 mm, 10 mm and 12 mm. After drying, drying rate, shrinkage, moisture content was measured which showed a decrease with increasing distance between electrodes, while energy efficiency increased with increasing distance between electrodes. The greater the distance between the electrodes for drying the potato slices, the smaller the shrinkage and water content decreases in the sample slices. Keywords: drying, electrohydrodynamics, electrodes, potatoes DOI: 10.7176/JNSR/9-24-04 Publication date: December 31st 2019

Corona Discharge Plasma Technology to Accelerate the Growth of Black Soybean Plants

Corona glow discharge plasma has been used to accelerate the growth of soybean black seed plants. This system consists a corona reactor with configuration of electrodes of multi points to plane. Multi points to plane electrodes system are designed with the distance between the electrodes 2 cm and number of points electrode was 64 of needles. Seeds were grouped to 5 groups of samples. Grouping was based on treatment time of plasma that were 6 minutes, 12 minutes, 18 minutes, 24 minutes and 30 minutes. The growth of the soybean seed black’s crop has been carried out by analyzing the amount of percentage germination, measuring the length of the stem, the width of the leaves. Measurement have been taken each five days until 30 days. The research results showed that 5 groups of samples irradiated by glow discharge corona plasma (IGDCP) more progressive growth comparing with seeds without irradiated by corona plasma (control).  Moreover, we found that the effectiveness of growth increases with increase of treatment irradiation time. For treatment irradiation time of 30 minutes after planted for 30 days, and compared with control samples, we found that escalates in length of 71.38%, number of leaves increases of 3.27%, wide leaves augment of 16.47%.  Percentage germination of samples with 30 minutes’ treatment time was 314.28% compare with control. We suppose that the increasing growth parameter of soybean black seed is cause of increasing nitrogen in seed by intrusion of nitrogen ion when irradiation corona discharge plasma. Keywords: electrodes, irradiation, plasma, soybean black seed, nitrogen ion