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Study on Characteristic of Pressure Drop by using Ejector
신유식(Y. S. Shin),이윤환(Y. H. Lee),허두상(D. S. Heo),정효민(H. M. Jeong),정한식(H. S. Chung) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
There are many important factors for breeding fish in an aquafarm. What is especially important for good quality breeding or fish is the maintenance of optimum aquaculture temperature. In summertime, when sea temperatures rise above 25℃ the growth condition is greater and diseases in fish spread. In this study water cooling system using a steam ejector was used to drop the temperature of the water in the aquafarm by about 5℃ from 25℃ or higher. To replace the present water cooling system, we focused on system operated by the latent heat of evaporation. Using a vacuum pressure to evaporate the water in an enclosed tank. The water cooling effects are dependent on the vacuum pressure in the enclosed tank, and the cooling water is generated by evaporation. As the experimental result, the absolute vacuum pressure was obtained with about 8~10㎜Hg with a the vacuum tank capacity of 85Liters. The reaching time needed to reach this vacuum pressure was about 8~10 minutes and had a water cooling temperature difference of 6℃.
CNC를 적용한 자동차 EGR 냉각기의 냉각성능에 관한 연구
이병호(B. H. Lee),김보한(B. H. Kim),김영진(Y. J. Kim),이윤환(H. U. Lee),정한식(H. S. Chung) 한국동력기계공학회 2008 한국동력기계공학회 학술대회 논문집 Vol.2008 No.11
Although combustion is essential in most energy generation processes, it is one 01 the major causes of air pollution. Circle fin exhaust pipes were designed to study the effect of cooling the recirculated exhaust gases (EGR) of Diesel engines on the chemical composition of the exhaust gases and the reduction in the percentages of pollutant emissions. The gases examined in this study were oxides of nitrogen (NOx), carbon dioxide (CO<sub>2</sub>) and carbon monoxide (CO). In addition, O<sub>2</sub> concentration in the exhaust was measured. The designs adopted in this study were exhaust pipes with solid and hollow fins around them direct surface force measurement in water using a nanosize colloidal probe Technique The direct force measurement between colloidal surfaces has been an essential topic in both theories and applications of surface chemistry. As particle size is decreased from micron size down to true Carbon nano Colloid size (<10 nm), surface forces are increasingly important. Nanoparticles at close proximity or high solids loading arc expected to show a different behavior than what can be estimated from continuum and mean field theories. The current tools for directly measuring interaction forces such as a surface force apparatus or atomic force microscopy (AFM) are limited to particles much larger than nanosize. Here a modified colloidal probe technique is suggested using a multiwalled. This paper use Water and CNC fluid at normal cooling system of EGR. Experimental result showed all good agreement at Re=2.54×10<sup>2</sup>.
탄소발열체의 외부유속 및 직경변화에 대한 비정상상태에서의 수치해석적 연구
배강열(K. Y. Bae),이윤환(Y. H. Lee),이상용(S. Y. Lee),이칠순(C. S. Lee),김봉곤(B. G. Kim),이상철(S. C. Lee) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper represents the numerical analysis in unsteady state on the variation of diameter and environmental velocity of carbon heating source. In general heating system, the oil and sheath heater is widely used, but these systems have many problems. So, the heating source with carbon ingredient has been researched in many country about manufacture, thermal and electrical properties. In this research; the carbon heating source was studied through numerical analysis on several conditions of unsteady state, heat generation, diameter and environmental velocity. The temperature distributions at steady state are appeared as a non-proportional linear pattern with variations of environmental velocity due to the Nesselt number with convective heat flux is proportioned to 0.805 of Reynolds number. As the radius is increasing, the temperature distributions is appeared the minus tilt because of the environmental condition is cooling by constant temperature. So, the correlation equation between temperature at steady state and environmental velocity was obtained.
한기학,임선욱,이윤환 한국농화학회 1971 Applied Biological Chemistry (Appl Biol Chem) Vol.14 No.3
The studies reported herein were conducted to inquire the effect of fused siliceous materials which mixed with sand and quartz added calcium fertilzer on rice grown on low available silica content soil. The applied nitrogen level were examined for the two plots, nitrogen 10㎏ and 20㎏ per 10a., and the siliceous materials(Wollastonite, Fused sand and Fused quartz) were applied as levels to 100㎏, 300㎏ and 500㎏ per 10a. in the pots. The results are summarized as follows; 1. The available silica content solved in N/2 HCl solution of fused sand was more than of Fused quartz but the silica solubility in 2% citric acid of fused quartz were higher than other. 2. The absorbed silica content by plant grown on the fused quartz plot was the highest among other siliceous materials and of fused sand and natural wollastonite were at almost equal. The ratio of absorbed silica of natural wollastonite was highest among them and in fused materials, the quartz was higher than sand. 3. The productivity of rice was increased by percentage of filled grain, weights of 1000 grains, and number of spikelets on account of the large quantity of the silica absorbed by plant Especially fused quartz showed the highest productive effect among siliceous materials and natural wollastonite and fused sand were similar effect. 4. From the above results, the fused quartz was selected as expected siliceous fertilizer on rice plant among them and the fused sand was equal effect to natural wollastonite.