Sökning: "Helical flow"

Hittade 5 uppsatser innehållade orden Helical flow.

  1. 1. Experimental validation of a periodic heat transfer CFD model of a vertical shell and tube heat exchanger

    Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

    Författare :Patrik Bengtsson; Dilip Kumar Vellore Saikumar; [2019]
    Nyckelord :;

    Sammanfattning : Flow obstructions are used as a passive design element in heat exchangers to enhance heattransfer. Further, a change in flow structure can also have a positive effect on the heat transfer. Avertical shell and tube heat exchanger, used to recover heat in the greywater stream, isinvestigated in this study. LÄS MER

  3. 2. Visualization and Quantification of Helical Flow in the Aorta using 4D Flow MRI

    Master-uppsats, Linköpings universitet/Institutionen för medicinsk teknik

    Författare :Filippa Gustafsson; [2016]
    Nyckelord :Helical flow; Helicity density; LNH; 4D Flow MRI; geometry of the aorta;

    Sammanfattning : Due to the complex anatomy of the heart, heart valves and aorta, blood flow in the aorta is known to be complex and can exhibit a swirling, or helical, flow pattern. The purpose of this thesis is to implement methods to quantify and visualize both the speed of helicity, referred to as the helicity density, and the direction of helicity, which is measured by the localized normalized helicity. LÄS MER

  4. 3. Calculation of Fluid Dynamic Loads on a Projectile During Firing : Development of a CFD-modelling Approach

    Master-uppsats, Linköpings universitet/Mekanisk värmeteori och strömningslära

    Författare :Viktor Hellberg; Rikard Fredriksson; [2016]
    Nyckelord :;

    Sammanfattning : The transition from inner to outer ballistics is a crucial part of the launch of a projectile from a recoilless rifle. Since a launch of the rifle is a rapid process and due to the extreme conditions in terms of accelerations and temperature, physical measurements are hard to achieve. LÄS MER

  5. 4. Characterization of greywater heat exchangers and the potential of implementation for energy savings

    Master-uppsats, KTH/Installations- och energisystem

    Författare :Jose Daniel Garcia; [2016]
    Nyckelord :Wastewater heat recovery; greywater heat exchanger; domestic hot water; energy savings; energy efficiency; residential households; NZEB; heat transfer modelling; feasibility study; potential of implementation; falling film effect; flow helical coil.;

    Sammanfattning : Buildings account for up to 32% of the total energy use in different countries. Directives from the European Union have pointed out the importance of increasing energy efficiency in buildings. LÄS MER

  7. 5. Modeling and Simulation of Elastic Rods with Intrinsic Curvature and Twist Immersed in Fluid

    Master-uppsats, KTH/Numerisk analys, NA

    Författare :Babak Maboudi Afkham; [2014]
    Nyckelord :;

    Sammanfattning : Understanding the dynamics of thin elastic rods that are immersed in fluid is fundamental in explaining many problems that arise in biology, physics and engineering. Solving the coupled system of rod-fluid in 3D is usually very costly, however in case of low Reynolds number, the three-dimensional problem can be reduced a one-dimensional problem on the centerline of the rod. LÄS MER