Essays about: "thermal hydraulics"

Showing result 1 - 5 of 14 essays containing the words thermal hydraulics.

1. 1. Investigation of coarse-grid CFD approach for nuclear engineering application

   University essay from KTH/Fysik

   Author : Michela Casarella; [2023]
   Keywords : Thermal-hydraulics; Nuclear reactor; CFD; Sub-channel; Coarse-grid; Turbulence; Pressure drop; Termisk-hydraulik; kärnreaktor; CFD; underkanal; grovkornigt nät; turbulens; tryckfall;

   Abstract : In this thesis, an innovative coarse grid CFD approach is developed that aims toexploit the capabilities of sub-channel codes and CFD methods while overcoming theirlimitations. In the approach, a very coarse mesh is implemented in the CFD softwareOpenFOAM and a new wall treatment, based on the traditional concept of the wallfunction, is applied to the wall boundary conditions of the domain to take into accountthe low resolution of the grid which does not allow to effectively capture the effect of thesolid walls on the thermo-hydraulics of the flow. READ MORE

3. 2. Thermal-hydraulic safety analysis of the HTTU and GEMINI+ cores in TRACE

   University essay from KTH/Fysik

   Author : Eva Joosten; [2022]
   Keywords : HTGR; TRACE; Thermal-Hydraulics; Safety; Heat Transfer; HTGR; TRACE; Termisk-Hydraulik; Säkerhet; Värmeöverföring;

   Abstract : With the coming of Generation IV systems, there is a need for thermal-hydraulic codes to model such advanced reactors. Codes for High Temperature Gas-cooled Reactors (HTGRs) already exist, but often suffer from insufficient validation and little user experience. READ MORE

4. 3. Simulation of IB-LOCA in TRACE : A semi-blind study of numerical simulations compared to the PKL test facility

   University essay from Uppsala universitet/Tillämpad kärnfysik

   Author : Matilda Tiberg; [2022]
   Keywords : Pressurized Water Reactor; Safetey analysis; LOCA; Intermediate Break; PKL; TRACE; transient; thermal hydraulics;

   Abstract : This thesis studied the performance of the thermal hydraulic software TRACE applied on an intermediate sized break (IB) happening on the cold leg in a pressurized water reactor (PWR), causing a loss-of-coolant accident (LOCA). The same accident has previously been simulated in the PKL Test Facility, which is a scaled version of a PWR and is used to simulate transients stemming from different accidents. READ MORE

5. 4. Construction and Validation of a Lab-scaleBorehole Thermal Energy Storage Model

   University essay from KTH/Skolan för industriell teknik och management (ITM)

   Author : Haoyang Dong; [2022]
   Keywords : borehole heat exchanger; lab-scale model; experimental construction; experiment test; validation; borrhålsvärmeväxlare; labbmodell; experimentell konstruktion; experimenttest; validering;

   Abstract : Borehole heat exchangers are widely used in heat pumps of residential buildings and industrialsystems. It is known as one of the most energy ecient technologies which provides heatingand cooling by using sustainable geothermal energy. The life time of borehole heat exchangerslasts more than 50 years which is longer than combustion boilers. READ MORE

6. 5. Thermal Hydraulics Simulations for Nuclear Energy

   University essay from Uppsala universitet/Tillämpad kärnfysik

   Author : Wilhelm Thunberg; [2022]
   Keywords : Simulation; Thermal Hydraulics; Nuclear Energy; CFD; Sub-channel; System Codes; Trace; Cobra; DNS; LES; RANS;

   Abstract : .... READ MORE