Sökning: "Dryout"

Visar resultat 1 - 5 av 15 avhandlingar innehållade ordet Dryout.

1. 1. Dryout and Power Distribution Effects in Boiling Water Reactors

   Författare :Carl Adamsson; Henryk Anglart; Barry Azzopardi; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Dryout; Film flow analysis; Power distribution; Measurements; Subchannel; Atomic physics; Atomfysik;

   Sammanfattning : Film flow measurements at several axial positions in round pipes with variousaxial power distributions are presented for conditions corresponding to normaloperation of a BWR. It is confirmed that the film flow rate approaches zero atthe onset of dryout. LÄS MER

3. 2. Flow boiling heat transfer, pressure drop and dryout characteristics of low GWP refrigerants in a vertical mini-channel

   Författare :Zahid Anwar; Björn Palm; Rahmatollah Khodabandeh; Maria Fernandino; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mini micro-channels; R1234yf; R152a; R600a; R134a; Boiling heat transfer; Pressure drop; Dryout; Correlation;

   Sammanfattning : Two-phase heat transfer in mini/micro-channels is capable of meeting the high cooling demands of modern high heat flux applications. The phase change process ensures better temperature uniformity and control for local hot spots. Furthermore, these compact channels could be helpful in reducing the required charge and material inventories. LÄS MER

4. 3. Measurements of Film Flow Rate in Heated Tubes with Various Axial Power Distributions

   Författare :Carl Adamsson; Henryk Anglart; Bengt Sundén; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; film flow; film thickness; dryout; power distribution; annular flow; Atomic physics; Atomfysik;

   Sammanfattning : Measurements of film mass flow rate for annular, diabatic steam-water flow in tubes are presented. The measurements were carried out with four axial power distributions and at several axial positions at conditions typical for boiling water reactors, i.e. 7 MPa pressure and total mass flux in a range from 750 to 1750 kg/m2s. LÄS MER

5. 4. Flow Boiling Heat Transfer in Single Vertical Channels of Small Diameter

   Författare :Claudi Martin Callizo; Björn Palm; Predrag Hrnjak; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; microchannel; heat exchanger; heat transfer; flow boiling; flow patterns; onset of nucleate boiling; dryout; critical heat flux; Mechanical and thermal engineering; Mekanisk och termisk energiteknik;

   Sammanfattning : Microchannel heat exchangers present many advantages, such as reduced size, high thermal efficiency and low fluid inventory; and are increasingly being used for heat transfer in a wide variety of applications including heat pumps, automotive air conditioners and for cooling of electronics.However, the fundamentals of fluid flow and heat transfer in microscalegeometries are not yet fully understood. LÄS MER

7. 5. Experimental Study of Post-Dryout Heat Transferin Annuli with Flow Obstacles

   Författare :Ionut Gheorghe Anghel; Henryk Anglart; Michele Andreani; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; annulus; post-dryout; temperature distribution; flow obstacles; new measurements; SRA - Energy; SRA - Energi;

   Sammanfattning : An experimental study on post dryout heat transfer regime in annuli with flow obstacles was conducted in the High-pressure Water Test (HWAT) loop at the Royal Institute of Technology in Stockholm, Sweden. An annulus consisting of two concentric heated pipes (12.7x24.3) mm, with total heated length equal to 3650 mm was employed as a test section. LÄS MER