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도자기용 단가마에서 CO<sub>2</sub>분석기를 사용한 효율적 소성방법 연구 I. 도자기 유약개발에 관한 연구
한상목,Han, Sang-Mok 강원대학교 산업기술연구소 1983 産業技術硏究 Vol.3 No.-
There are chief concerns every ceramist must keep in mind when firing a single kiln : Being able to read and control the kilns temperature as the firing progresses and as the kiln cools after firing. Controlling the atmosphere of the kiln in order to create desired glaze and clay body effects. Getting the most efficient use from the fuel-the most heat possible from the least fuel possible. The more exactly, author can control these factors with some result.
경사환형관내 입자 이송을 위한 고-액 회전유동에 관한 연구
한상목(Sang-mok Han),최성욱(Sung-Wook Choi),김영주(Young-ju Kim),황영규(Young-kyu Hwang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.4
The present study concerns an experimental and numerical study of fully developed laminar flows of a non-Newtonian fluid through a concentric annulus, in combination with a bulk axial flow and inner cylinder rotation. And the problem of instability of isothermal viscous flow between rotating concentric annulus is also important problem in a rotating electrical machine, especially in the drilling of oil well. This study concerns the phenomena and variables which control the rate of heat transfer in the gap of a rotating annulus. The objective of this study is to study the non-isothemal case, showing the effect of a radial temperature gradient in the annulus on the instability of this type flow. In this study the effect of axial flow rate, rotational speed of inner cylinder and temperature gradient between the cylinders on the heat transfer will be investigated.
안쪽축의 회전에 따른 Slim hole 환형관내 고-액 혼합 유동에 관한 연구
한상목(Sang-mok Han),김영주(Young-ju Kim),우남섭(Nam-sub woo),황영규(Young-kyu Hwang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
An experimental and numerical investigation was carried out to study solid-liquid mixture upward hydraulic transport of solid particles in a vertical and inclined annulus with rotating inner cylinder. Lift forces acting on a fluidized particle plays a central role in many importance applications, such as the removal of drill cuttings in horizontal drill holes, sand transport in fractured reservoirs, sediment transport and cleaning of particles from surfaces, etc. In this study a clear acrylic pipe was used in order to observe the movement of solid particles. Annular velocities varied from 0.4 to 1.2 m/s. Effect of annulus inclination and drill pipe rotation on the carrying capacity of drilling fluid, particle rising velocity, and pressure drop in the slim hole annulus have been measured for fully developed flows of water and of aqueous solutions. For both Newtonian and Non-Newtonian, the higher the concentration of the solid particles is, the larger the pressure gradients become.
한상목(Sang-mok Han),우남섭(Nam-sub Woo),하지호(Ji-ho Ha),김영주(Young-ju Kim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
In directional drilling, it is difficult to adjust and control the cuttings, so it is very important to evaluate the flow characteristics of a drilling flow field. In this study, solid-liquid two-phase flow experiments have been carried out in non-Newtonian fluids for hole inclinations from vertical to 75 degrees, flow velocities from 0.33 m/s to 0.66 m/s, particle concentration from 4 to 16 %, and pipe rotations from 0 to 400 rpm. Pressure drop within the test section, and particle volume fraction are measured for the above test conditions. These quantities were influenced by particle concentration within the flow, pipe rotation, flow volume, and inclination of the annulus. Moreover, empirical correlations were developed for estimating friction coefficient and particle volume fraction inside annulus. The new correlations generated in this study are believed to be very practical and handy when they are used in the field. Therefore, this study can provide meaningful data for directional drillings.
한상목(Sang-Mok Han),김정환(Jeong-Hwan Kim),황영규(Young-Kyu Hwang),우남섭(Nam-Sub Woo),김영주(Young-Ju Kim) 한국해양공학회 2012 韓國海洋工學會誌 Vol.26 No.2
During drilling, the precipitation velocity of cuttings within an annulus depends on the density and configuration of the cuttings, and on the density, viscosity, and rheological characteristics of the drilling fluid. In directional drilling in particular, it is difficult to adjust and control the cuttings. In contrast to vertical drilling, it is very important to evaluate the flow characteristics of a drilling flow field. However, research on the transfer features of cuttings is inadequate. In this study, in order to identify transfer features of cuttings, an experiment was performed under wide-ranging conditions by constructing a slim hole annulus (44 ㎜×30 ㎜) device. In this experiment, the particle volume fraction were influenced by particle size, particle concentration within the flow, pipe rotation, flow volume, and inclination of the annulus. In addition, a mathematical formula for volumetric concentration was deduced and compared to the test results and behavior of cuttings under the other drilling condition was made to be predicted. Therefore, this study can provide meaningful data for vertical and horizontal drilling, and for directional drilling.
굴착유체내 입자이송을 위한 고-액 혼합 유동특성에 관한 연구
한상목(Sang-mok Han),최성욱(Sung-wook Choi),김영주(Young-ju Kim),우남섭(Nam-sub woo),황영규(Young-kyu Hwang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
An investigation is conducted to study a 2-phase vertically upward hydraulic transport of solid particles in slim hole concentric annulus with rotation of the inner cylinder. Lift forces acting on a fluidized particle plays a central role in many importance applications, such as the removal of drill cuttings in horizontal drill holes, sand transport in fractured reservoirs, sediment transport and cleaning of particles from surfaces. In this study a clear acrylic pipe was used in order to observe the movement of solid particles. Annular velocities varied from 0.3 m/s to 2.0 m/s. Main parameters considered in the study were inner-pipe rotary speed, fluid flow regime and particle injection rate. Pressure drops and average flow rates were measured in the Reynolds number range of 10²<Re<10⁴. For both water and CMC solutions, the higher the concentration of the solid particles is, the larger the pressure gradients become.
한상목(Sang-mok Han),김영주(Young-ju Kim),우남섭(Nam-sub woo),황영규(Young-kyu Hwang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
An investigation is conducted to study a solid-liquid mixture vertically upward hydraulic transport of solid particles by non-Newtonian fluids in slim hole concentric annulus with rotating inner cylinder. In this study a clear acrylic pipe was used in order to observe the movement of solid particles. Annular velocities varied from 0.4 ㎧ to 1.2 ㎧. The mud systems which were utilized included aqueous solution of sodium carboxymethyl cellulose (CMC) and bentonite solutions. Solid volumetric concentration and pressure drops were measured for the various parameters such as inclination' angle, flow rate, and rotational speed of inner cylinder.