• Journal of Biosystems Engineering
• /
• 제35권6호
• /
• pp.393-400
• /
• 2010

Uniform and rapid pre-drying of mandarin is important to improve the storage quality. The aim of this study was to suggest the basic design of forced ventilated pre-drying facility for mandarin by thermal flow analysis using computational fluid dynamics software (FLUENT 6.2). Developed CFD simulation model was verified by comparison with experimental data. Airflows and temperature distributions in the five conceptional designs including existing ordinary temperature storage rooms were analyzed and appropriate basic design was determined. Analysis of the effect of arrangement of windows and exhaust fans on thermal flow in facility was carried out for more detailed design. The results of this investigation showed that the predicted airflow velocity by CFD simulation showed a good agreement with the measured value and optimum design condition for simulated forced ventilated pre-drying facility of mandarin has two exhaust fans and two windows on both sidewalls and cover on loaded mandarin.

• 한국수산과학회지
• /
• 제8권3호
• /
• pp.171-176
• /
• 1975

개불, Urechis unicinctus, 건조중의 핵산관계물질의 변화를 음이온교환칼럼크로마토그래피로 실험하여 다음과 같은 결과를 얻었다. 살아있는 개불에는 AMP가 건물량기준으로 $6.8\mu\;mole/g$ 로서 가장 함량이 높았고, IMP는 존재하지 않았다. 건조중 ATP, ADP, AMP는 감소하고 inosine과 hypoxanthine은 증가하였으나, AMP이외의 다른 pattern은 함량이 적고 개불에서와 마찬가지로 건조한 개불에 있어서도 AMP가 건물량기준으로 $5\mu\;mole/g$로서 함량이 가장 많았다.

• 한국식품영양과학회지
• /
• 제36권9호
• /
• pp.1182-1187
• /
• 2007

건조된 명태들은 전반적으로 다가불포화지방산이 감소하고 단일불포화지방산은 증가하는 경향을 보였다. 특히 주기적인 자연냉동과 해동을 반복하면서 건조된 명태(미숙성황태)를 장기간 숙성하여 완성한 황태의 지방산 조성은 북어나 미숙성황태와 비교해 볼 때, 원료시료(명태)간의 차이를 감안하더라도 특징적인 차이를 보였다. 총 유리아미노산 함량도 황태가 북어나 미숙성황태보다 낮게 나타나 불포화지방산과 유리아미노산의 반응에 의한 점진적인 갈변화 현상을 설명해 주는 것으로 판단된다. 황태의 수용성 갈변물질은 주로 숙성단계에서 많이 형성되는 것으로 추정되었다.

• 한국약용작물학회지
• /
• 제19권5호
• /
• pp.354-361
• /
• 2011

In order to product dry goods of Gastrodiae Rhizoma with high quality, tubers were treated with various dry methods such as cutting, drying methods and steaming. In cutting than no cutting, they were shown shorter drying hours and lower drying yield. Drying hours in freeze drying was shorter than those of hot air and far-infrared ray. Total polyphenol content was higher in cutting than no cutting. According to steaming, it was increased in freeze drying but decreased rapidly in the other dry methods. Among all treatments, hot air dry treatment with cutting and no steaming had the highest total polyphenol content. Gastrodin and 4-hydroxybenzyl alcohol contents generally were similar or higher in cutting than no cutting. By steaming, gastrodin content in freeze drying was decreased but 4-hydroxybenzyl alcohol content was increased. But hot-air and infrared ray dry, they were shown opposite results. Gastrodin and 4-hydroxybenzyl alcohol contents showed opposite reaction to each other and were shown various response by dry methods.

• 콘크리트학회논문집
• /
• 제22권1호
• /
• pp.85-91
• /
• 2010

이 연구에서는 24~60 MPa 범위의 콘크리트에 대하여 다양한 양생조건과 측정 방법을 적용하여 재령에 따른 조건별 건조수축량을 비교하였고, 이를 통해 실험 방법의 적합성 및 예측 방법의 적용성을 검토하였다. 연구 결과에 따르면, 28일 양생이 가장 적은 건조수축을 나타냈으며, 저강도 콘크리트 봉합양생의 경우 탈형 후부터의 변형률을 비교 해보면, 표준양생의 건조수축과 크게 변하지 않는 것으로 나타났으나, 고강도 콘크리트 봉합양생의 경우 자기수축이 크게 발생하여 더 큰 건조수축을 나타냈다. 매립 게이지를 사용해도 효율적인 건조수축량 측정이 가능하며, 접지(contact) 게이지로 측정된 값이 매립 게이지로 측정한 값보다 작게 나타났다. 실험 결과는 EC2 모델예측식과 가장 잘 일치하는 것으로 나타났다.

• 방사선산업학회지
• /
• 제6권1호
• /
• pp.89-94
• /
• 2012

Three-dimensional network hydrogels were prepared by ${\gamma}$-irradiation of aqueous solutions of poly(vinyl alcohol) (PVA) and glycerol (Gly). Oven-drying was used to measure the gel fraction (G), hydration (H) or swelling behavior (S) of the prepared hydrogels. This study made a hypothesis that hydrogen bonds due to addition of glycerol and change of dry states such as freeze-drying (FD), room-drying (RD) and oven-drying (OD) acts on the G, H, and S. Interesting results on the hydrogen bonding effect in the prepared hydrogels are monitored at different drying conditions. The FD samples have a higher G values with increase in glycerol content as compared with the OD and RD samples. The formation of strong hydrogen bonding network among Gly molecules and hydrogel matrix was considered as the main driving force, resulting in the changes in the G, H, and S of the hydrogels under different drying conditions.

• 한국식품과학회지
• /
• 제26권6호
• /
• pp.805-813
• /
• 1994

호박 고지, 고구마 줄기, 토란대, 및 도라지를 citric acid 용액 침지, 아황산염 용액 침지, 또는 황 훈중 등의전처리를 하여 천일 건조하거나 서로 다른 온도(50, 70, 90, $150^{\circ}C$)에서 열풍 건조한 후에, 실온 저장 중에 곰팡이 발생, 건조 상태 및 수화 복원 상태에서의 관능적 품질을 조사하였다. 호박 고지는 수분 함량이 15% 이하, 고구마 줄기는 20% 이하, 토란대는 25% 이하, 도라지는 15% 이하로 건조하여 PE film에 포장하여 실온에 저장했을때 3 개월여 동안 곰팡이가 발생하지 않았다. 전처리. 방법으로는 채소를 건조 전에 아황산염에 침지하거나 황훈중 처리했을 때 곰팡이 발생이 저지되었다. 엽록소를 함유한 채소는 전반적으로 열풍 건조한 경우가 천일건조한 경우에 비하여 현저히 관능적 품질이 우수했으며, 아황산염 용액에 침지하여 oven에 건조할 경우에 다른 처리 제품보다 관능적 품질이 대체적으로 좋았다. 도라지의 경우는 황 훈증이나 아황산 용액 침지가 건조 후의 제품의 품질에 다소 좋은 영향을 보였으나 건조방법은 관능적 품질에 큰 영향을 미치지 않았다. 건조온도는 도라지를 제외하고는 대체척으로 건조 실험에 사용한 온도 중에서 가장 낮은 $50^{\circ}C$에서 가장 좋은 품질의 건조 채소 제품을 얻을 수 있었으며, 모든 품목에 대하여 $105^{\circ}C$에서 건한 제품은 관능적 품질이 매우 떨어졌다. 채소틀 낮은 온도에서 건조할 때 채소의 복원율이 높았으며 복원 후외 관능적 품질도 채소의 건조 온도가 낮을수륵 좋았다.

• 한국의류산업학회지
• /
• 제1권3호
• /
• pp.259-263
• /
• 1999

This study was carried out to investigate the changes of thermal properties such as warmth retaining and contact warm/cool feeling of commercial dress shirts by repeated washing and drying by sun and dryer. Three kinds of fabrics such as cotton 100%, cotton/polyester 80/20% and polyester 100% were repeatedly washed and dried, and then used as specimen. Thermo Labo II type was employed to measure the thermal properties. At the same time, structural properties such as thickness, weight, bulk density, porosity, moisture vapor permeability and air permeability were analysed.

• 한국전산유체공학회지
• /
• 제20권3호
• /
• pp.70-78
• /
• 2015

Turbulent flow and heat transfer characteristics of textile machine are numerically investigated. To examine the influence of flow structures on the drying performance of fabrics, the nozzle shape of high temperature chamber is changed. For several nozzles, flow and heat transfer characteristics are discussed. The results show that the drying performance is improved by controlling the angle and arrangement of nozzles corresponding to different drying conditions. This feature is strongly related to the enhancement of turbulent fluctuations and secondary flows.

• Plant Resources
• /
• 제5권2호
• /
• pp.124-140
• /
• 2002

The effects of drying agents and ethyl alcohol treatment on the flower color of Gentiana uchiyamai. The flower color was not much changed in flower sheet, in the case of absorbtion papers only. The color was least changed in Korean and China hwasunjis, in the case of absorbtion papers and silica gel treatment. The color was less changed in flower sheets, window papers, and China hwasunjis, and was most changed in newspapers, in the case of absorbtion papers and Na$_2$SO$_4$ treatment. The color was least changed in China hwasunjis, and most changed in dampened papers, in the case of absorbtion papers and CaO treatment. The color tended to change far from the original one, as treatment time got longer, in the case of 0.01M and 0.lM of tartaric acid. The longer the treatment time and the bigger the concentration of ethyl alcohol, the bigger flower color.