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경사 환형관내 고-액 비뉴튼유체의 회전 유동에 관한 연구
최성욱(Sung Wook Choi),한상목(Sang Mok Han),황영규(Young Kyu Hwang) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
The slim hole drilling and directional drilling were developed. Currently this technology has been applied in the Oil industry. but A study about flow characteristics in a slim hole is still insufficient. This study has been proceeded with a annulus(the ratio of radius is 0.7 between inner pipe and outer pipe) which is able to change inclination. Variations of the inclination, the particle injection rate, RPM (the inner pipe rotation speed) and the type of fluid were used in the experimentation. RPM is changed 0rpm to 400rpm. The inclination is 0°∼75°. Three type of fluids which are 0.2~0.8 CMC solution, 2∼5% Bentonite solution and Diesel are used on this study. The sand used in experimentation is 2mm homogeneous size. The measured data indicated that the particle volume fraction and pressure loss were strongly affected by the inner pipe rotaion speed and gradient of annulus.
경사진 Slim hole 환형관내 비뉴튼 2상 유체의 유동특성에 관한 실험적 연구
최성욱(Sung Wook Choi),한상목(Sang Mok Han),황영규(Young Kyu Hwang) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4
The slim hole drilling and directional drilling were developed. Currently this technology has been applied in the Oil industry. But a study about flow characteristics in a slim hole is still insufficient. This study has been proceeded with a annulus(the ratio of radius is 0.7 between inner pipe and outer pipe) which is able to change inclination. Variations of the inclination, the particle injection rate, RPM (the inner pipe rotation speed) and the type of fluid were used in the experimentation. RPM is changed Orpm to 400rpm. The inclination is 0°~75°. Two type of fluid which are 2~5% Bentonite solution and Diesel are used on this study. The sand used in experimentation is 2㎜ homogeneous size. The measured data indicated that pressure loss, the particle transport ratio and the particle volume fraction were strongly affected by the inner pipe rotaion speed and gradient of annulus.
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.
Slim hole 환형관내 고-액 혼합 유체의 회전유동에 관한 연구
한상목(Sang-Mok Han),우남섭(Nam-Sub woo),황영규(Young-kyu Hwang),김영주(Young-Ju Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
An experimental study was carried out to study the 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 higher particle volume concentration, the hydraulic pressure drop of mixture flow increases due to the friction between the wall and solids or among solids.
Solid-liquid mixture flow through a slim hole annulus with rotating inner cylinder
한상목,우남섭,황영규 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.2
An experimental study was conducted to study solid-liquid mixture upward hydraulic transport of solid particles in vertical and inclined annuli with rotating inner cylinder. Lift forces acting on a fluidized particle play a central role in many important applications, such as the removal of drill cuttings in horizontal drill holes, sand transport in fractured reservoirs and sediment transport, etc. Annular fluid velocities varied from 0.4 m/s 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 of sodium carboxymethyl cellulose (CMC) and bentonite, respectively. For higher particle feed concentration, the hydraulic pressure drop of mixture flow increases due to the friction between the wall and solids or among solids.
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.
굴착유체의 Slim Hole 환형관 내 유동특성에 관한 연구
서병택,우남섭,황영규 대한설비공학회 2006 설비공학 논문집 Vol.18 No.4
The paper concerns an experimental study of fully developed laminar flow of a Newtonian and non-Newtonian liquid in concentric annuli with combined bulk axial flow and inner cylinder rotation. Pressure losses and skin friction coefficients have been measured for Newtonian fluid, water and non-Newtonian fluids, 0.2% aqueous of sodium carboxymethyl cellulose(CMC) and 5% bentonite solutions, when the inner cylinder rotates at the speed of 0∼500rpm. The influences of rotation, radius ratio and working fluid on the annular flow field are investigated. And the new correlations among the skin friction coefficient, the Reynolds number and the Rossby number are presented with reasonable limits of accuracy in laminar flow regime.
〈학술논문〉 : 경사진 Slim hole 환형관내 고-액 비뉴튼 유체의 이송특성
최성욱(Sung Wook Choi),한상목(Sang Mok Han),김영주(Young Ju Kim),황영규(Young Kyu Hwang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
As the development of petroleum technology, the slim hold drilling and the directional drilling are developed. Currently this technology has been applied in the technology industry, but these studies are still insufficient. This study has been proceeded with a annulus(the ratio of radius is 0.7 between inner pipe and outer pipe) which is able to change inclination. Variations of the inclination, the particle injection rate, RPM (the inner pipe rotation speed) and the type of fluid were used in the experimentation. RPM is changed 0rpm to 400rpm. The particle injection rate is 4-16%. The inclination is 0°-60°. Two type of fluid which are CMC at concentrations in range of 0.2-0.8%, and 5% Bentonite solution are used on this study. The sand which is used in experimentation is 2㎜ homogeneous size. The transporting ratio and the pressure loss are defined with the different type of fluid through the experimentation.
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.
Slim hole 환형관내에서 굴착유체의 유동특성에 관한 연구
서병택,장영근 한국기계기술학회 2007 한국기계기술학회지 Vol.9 No.3
The paper concerns an experimental and numerical study of fully developed laminar flow of a Newtonian, water and non-Newtonian fluids, 0.2% aqueous of sodium carboxymethyl cellulose(CMC) solution in concentric and eccentric annuli with combined bulk axial flow and inner cylinder rotation. Pressure losses and skin friction coefficients have been measured when the inner cylinder rotates at the speed of 0~300 rpm. The influences of rotation, radius ratio and working fluid on the annular flow field are investigated.