다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

http://repositorium.sdum.uminho.pt/bitstream/1822/48763/1/1-s2.0-S037026931200857X-main.pdf

Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC

https://digital.csic.es/bitstream/10261/108964/1/experiment%20at%20the%20LHC.pdf

Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC

The ATLAS detector as installed in its experimental cavern at point 1 at CERN is described in this paper. A brief overview of the expected performance of the detector when the Large Hadron Collider begins operation is also presented.

The ATLAS Experiment at the CERN Large Hadron Collider

National Institute of Standards and Technology における超伝導研究及び生活

Cfd simulation of solar receiver jet impingement heat transfer: rans vs les

In this paper, a three dimensional analysis of the thermal and thermodynamic performance of a parabolic trough receiver is investigated. The analysis involves determination of the heat flux on the receiver’s absorber tube using the Monte Carlo raytrace method and using computational fluid dynamics to investigate the thermal and thermodynamic performance. Our analysis shows that the use of higher concentration ratios increases the receiver’s temperature gradients and entropy generation rates. For rim angles lower than 60 o , the high heat flux peaks result in high temperature gradients in the receiver’s absorber tube as well as high entropy generation rates. The absorber tube temperature gradients and entropy generation rates do not change significantly as rim angles increase above 80 o . The influence of rim angles on receiver thermal performance reduces as the flow rates increase above 8.55 × 10 3 m

https://repository.up.ac.za/bitstream/handle/2263/44757/Mwesigye_Thermal_2014.pdf;sequence=1

Thermal and thermodynamic analysis of a parabolic trough receiver at different concentration ratios and rim angles

This paper presents the effects of saturation temperature and inclination angle on convective heat transfer during condensation of R134a in an inclined smooth copper tube of inner diameter of 8.38 mm. Experiments were conducted for inclination angles ranging from −90° (vertical downward) to +90° (vertical upward) for mass fluxes between 100 kg/m2s and 400 kg/m2s and vapour qualities between 0.1 and 0.9 for saturation temperatures ranging between 30 °C and 50 °C. The results show that saturation temperature and inclination angles strongly influence the heat transfer coefficient. With respect to saturation temperature, an increase in saturation temperature generally leads to a decrease in heat transfer coefficient irrespective of the inclination angle. The effect of inclination angle was found to be more pronounced at mass fluxes of 100 kg/m2s and 200 kg/m2s for the range of vapour qualities considered. Within the region of influence of inclination there is an optimum angle which is between 15° and −30° (downward flow). The inclination effect corresponds to the predominance of the effect of gravity on the flow distribution.© 2013 ASME

Condensing Heat Transfer Coefficients for R134a at Different Saturation Temperatures in Inclined Tubes

Computational investigation of single and multi-jet array impingement boiling

In this research Lagrangian method is employed to track the nanoparticles inside a differentially heated walls nanofluidfilled cavity in natural convective flow. The thermo-physical properties of the solid-liquid mixture is also included in Eulerian frame. There are multiple interactions between fluid and particles which turns the simulations for solid-liquid highly complicated. ANSYS FLUENT 15.0 was used in this research to model submicron particles. Moreover, important interaction forces are implemented in the software as a User Defined Function (UDF) to modify the Lagrangian model. Brownian movement of the particles is assumed as a diffusion force acting on each particle during small user defined time step. Pressure gradient, gravity, virtual mass and Thermophoresis forces have also added to the force balance equation. Electrostatic forces are the contributing factors for stability of the nanofluid which they are needed to be present in dynamic equation of the particles. The importance of the forces on distribution of the particles is compared. The results show that the presence of these forces has considerable impact on nanoparticles concentration profiles. INTRODUCTION Some experimental and theoretical analyses of nanoparticles-liquid mixture have shown that nanofluids thermo-physical properties can be treated as highly homogeneous mixture properties [1-3]. On the other hand, the distribution of nanoparticles concentration particularly at the vicinity of the walls cannot be ignored [4, 5]. Considering some important interaction forces could improve the heat transfer results and somehow concentration distribution of solid-liquid flows, but the nanoscale fluid flow is complicated and different than other sizes of particulate flows. Some researchers [6,7] mentioned that Brownian diffusion and thermophoretic forces are the main contributing factors of nanoparticles distribution and other forces are weak, such as non-uniform shear rate, viscosity gradient, gravity and so on. Hwang et al. [7] showed that thermo-physical properties of nanofluids are the most significant parameters in calculation of heat and flow features. Even though, knowing these will not lead to understand the real distribution of nanoparticles inside the flow. Discrete phase modelling (DPM) could be the useful approach to cover some parts of weaknesses of others [8]. This model specifically considers the effects of each force in force balance equation of the particles. As a result, the influences of other forces such as lift force due to high and non-uniform shear rate and electrostatic forces can be included, which was mentioned by some researchers as the main phenomena happening in nanofluids [4]. Therefore, study of considering other forces specially lift, Brownian diffusion (as a force) and electrostatic forces in DPM is the motivation of this research. Also, the heat and flow features are calculated based on thermo-physical properties of the nanofluid and similar to single phase modelling.

Josua P. Meyer

Papers

Cfd simulation of solar receiver jet impingement heat transfer: rans vs les

Thermal and thermodynamic analysis of a parabolic trough receiver at different concentration ratios and rim angles

Condensing Heat Transfer Coefficients for R134a at Different Saturation Temperatures in Inclined Tubes

Computational investigation of single and multi-jet array impingement boiling

Natural convection study of brownian nano-size particles inside a water-filled cavity by lagrangian-eulerian tracking approach