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3차원 채널 형상 변화에 따른 마이크로 채널 판형 열교환기의 열적 특성 수치해석
서장원(Jang-Won Seo),이규정(Kyu-Jung Lee),전승원(Seung-Won Jeon),이춘식(Chun-Sik Lee),문정은(Chung-Eun Moon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The plate heat exchangers have been widely employed in the cooling systems for their compact size and high performance. In general, the flow passage of a compact plate heat exchangers are characterized by a small hydraulic diameter and low velocity. In this study, the microchannel plated heat exchangers were numerically investigated with I(straight), V, Y-channel shapes and Reynolds number under the counter flow. The material of micro-structured plate is STS304 and water is utilized as a working fluid. The averaged pressure drops from in let to outlet and total heat transfer rates were calculated. The results were compared with those of the straight micro channel.
Polymeric Membrane Cesium-Selective Electrodes Based on Quadruply-bridged Calix[6]arenes
최은미,오혜진,고승화,최용국,남계춘,전승원,Choe, Eun Mi,O, Hye Jin,Go, Seung Hwa,Choe, Yong Guk,Nam, Gye Chun,Jeon, Seung Won Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.12
New quadruply-bridged calix[6]arenes (I-V) have been studied as cesium selective ionophores in poly(vinyl chloride) (PVC) membrane electrodes. PVC membranes were prepared with dioctyl sebacate (DOS) or 2-nitrophenyl octyl ether (o-NPOE) as the sol vent mediator and potassium tetrakis(p-chlorophenyl)borate as the lipophilic salt additive. These ionophores produced electrodes with near-Nernstian slope. The selectivity coefficients for cesium ion with respect to alkali, alkaline earth and ammonium ions have been determined. The lowest detection limit (logaCs+ = -6.3) and the higher selectivity coefficient (logkpotCs+,Rb+ = -2.1 by SSM, -2.3 by FIM for calix[6]arene I) for Cs+ have been obtained for membranes containing quadruply-bridged calix[6]arenes (I, Ⅱ, Ⅲ), which have no para t-butyl substituents on the bridging benzene ring.