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열교환기 내부 유로 꺾임각 변화에 따른 국소 열/물질전달 특성 고찰
장인혁(In Hyuk Jang),황상동(Sang Donghwang),조형희(Hyung Hee Cho) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
An experimental study is conducted to investigate the effects of duct corrugation angle on heat/mass transfer characteristics in wavy ducts by using a naphthalene sublimation technique, The corrugation angles of the wavy ducts are 145˚, 130˚ and 115˚. and the Reynolds numbers based on the duet hydraulic diameter vary from 300 to 3,000. At the low Re(Re≤1000), high heat/mass transfer regions are formed by the secondary vortex flows called Taylor-Gortler vortices on both pressure-side and suction-side walls. At the high Re(Re≤1000), the effects of these secondary flows are vanished. As corrugation angle decreases, the local peak Sh induced by Taylor-Gortler vortices are increased and average Sh also enhanced. More pumping power (pressure loss) is required with the smaller corrugation angel due to stronger secondary vortex flows.
비균형적인 앉은자세 교정을 위한 힘-감지 저항센서 이용 연구
변상필(Sang Pil Byun),장인혁(In Hyuk Jang),박기혁(Ki Hyuk Park),손량희(Ryang Hee Sohn),이원구(Won Gu Lee) 한국산업융합학회 2014 한국산업융합학회 논문집 Vol.17 No.4
In this study, we present a method for correcting unbalanced sitting posture alignment to its optimal position, by designing a chair equipped with pressure sensor. With increasement in sedentary work, such as office work or study, people are now spending more time in chair. To accommodate sedentary life styles, many chairs are being designed for a comfortable sitting condition. However, without awareness and efforts for correct sitting posture, it may not be possible to achieve such condition. When the weight is not distributed evenly while sitting, it may cause various diseases such as scoliosis and a herniated disc. Being inspired by such facts, we have progressed basic researches to maintain the correct sitting posture. To demonstrate the proof-of-concept validation, we installed a series of sensors to a chair and then measured the changes in pressure distribution in various postures. The results show that this approach can be potentially helpful for understanding how fundamental problems due to unbalanced sitting posture can be corrected and maintained properly.