Sökning: "heat dissipation"

Visar resultat 6 - 10 av 86 avhandlingar innehållade orden heat dissipation.

1. 6. Fundamental studies of non-premixed combustion in turbulent wall jets using direct numerical simulation

   Författare :Zeinab Pouransari; V. Arne Johansson; Christer Fureby; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Turbulence; non-premixed combustion; global reaction; direct numerical simulation; wall-jet; heat release; mixing scales; heat transfer; Other engineering mechanics; Övrig teknisk mekanik;

   Sammanfattning : The present thesis deals with the fundamental aspects of turbulent mixingand non-premixed combustion in wall-jet flows. Direct numerical simulations(DNS) of compressible turbulent flows are performed in a wall-jet configura-tion, which has a close resemblance to many industrial combustion applica-tions. LÄS MER

3. 7. Novel approaches in modeling of soil carbon : Upscaling theories and energetics

   Författare :Arjun Chakrawal; Stefano Manzoni; Hyun-Seob Song; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Microorganisms; soil C cycling; spatial heterogeneity; energetics; thermodynamics; microbial metabolism; calorespirometric ratio; microbial traits; heat dissipation; microscale; Physical Geography; naturgeografi;

   Sammanfattning : Soils contain more carbon (C) than terrestrial (above ground) and atmospheric carbon combined. Mismanagement of soil C could lead to increased greenhouse gas emissions, whereas practices leading to increased C storage would help mitigate climate change while improving soil fertility and ecological functions. LÄS MER

4. 8. Numerical Investigation of Turbulent Fluid Flow and Heat Transfer in Complex Ducts

   Författare :Masoud Rokni; Värmeöverföring; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SED; WET; GGDH; RNG; RSM; EASM; Low-Reynolds; Non-linear k-e; Heat transfer; Turbulent; Complex ducts; Secondary flows; Temperature invariance; Energy research; Energiforskning;

   Sammanfattning : Th need for a reliable and reasonable accurate turbulence model without specific convergence problem for calculating duct flows in industrial applications has become more evident. In this study a general computational method has been developed for calculating turbulent quantities in any arbitrary three dimensional duct. LÄS MER

5. 9. The heat is on : Evaluation of workplace heat stress under a changing climate

   Författare :Karin Lundgren Kownacki; Ergonomi och aerosolteknologi; []
   Nyckelord :occupational heat stress; India; case studies; interventions; international standards; productivity; climate change;

   Sammanfattning : Background: There are several scientific indications that increasing heat due to climate change is going to become the next big societal and scientific challenge. Climate change is recognized as a significant public health threat. However, there is a lack of research on its impacts on occupational safety and health. LÄS MER

7. 10. Optimal Pin Fin Heat Exchanger Surface

   Författare :Hamid Nabati; Jafar Mahmoudi; Mohsen Assadi; Mälardalens högskola; []
   Nyckelord :Pin Fin; CFD; Numerical Simulation; Power Transformer; TECHNOLOGY; TEKNIKVETENSKAP; Energy- and Environmental Engineering; energi- och miljöteknik;

   Sammanfattning : This research presents the results of numerical study of heat transfer and pressure drop in a heat exchanger that is designed with different shape pin fins. The heat exchanger used for this research consists of a rectangular duct fitted with different shape pin fins, and is heated from the lower plate. LÄS MER