Prediction of CHF in vertical heated tubes based on CFD methodology

Zhang, Rui; Cong, Tenglong; Tian, Wenxi; Qiu, Suizheng; Su, G.H.

doi:10.1016/j.pnucene.2014.10.001

Cited by 54 publications

(9 citation statements)

References 11 publications

(10 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The amount of CHF obtained in the present study and research of Zhang et al is 48 MW/m 2 and 50.5 MW/m 2 respectively, which it shows good accuracy and validity between the present work and the research conducted by Zhang et al. 24 Furthermore, the comparison of the vapor volume fraction between the present study and research of Krepper et al. 15 (case2) has carried out, which is visible in Figure 4.…”

Section: Validationsupporting

confidence: 82%

“…In order to observe the validity of the results in this simulation, a comparison has been done between the present research and work of Zhang et al 24 The diagram of temperature variations based on the length of the tube is visible in Figure 3. The amount of CHF obtained in the present study and research of Zhang et al is 48 MW/m 2 and 50.5 MW/m 2 respectively, which it shows good accuracy and validity between the present work and the research conducted by Zhang et al 24 Furthermore, the comparison of the vapor volume fraction between the present study and research of Krepper et al 15 (case2) has carried out, which is visible in Figure 4. As it is visible in Figure 4, the results have a good agreement.…”

Section: Validationmentioning

confidence: 66%

“…In order to observe the validity of the results in this simulation, a comparison has been done between the present research and work of Zhang et al. 24 The diagram of temperature variations based on the length of the tube is visible in Figure 3. The amount of CHF obtained in the present study and research of Zhang et al is 48 MW/m 2 and 50.5 MW/m 2 respectively, which it shows good accuracy and validity between the present work and the research conducted by Zhang et al.…”

Section: Validationmentioning

confidence: 66%

See 2 more Smart Citations

Prediction of critical heat flux in flow boiling process under the effect of different operating parameters

Abedini

Behboudi

Karachi

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

In the present study numerical simulation of flow boiling process has been conducted for evaluation of critical heat flux conditions under the effect of different parameters (mass flux, heat flux, channel length and surface roughness). Comparison between the results of the present study and previous researches were done. The comparison shows a good agreement between the present study and previous researches. The three different turbulence models (k-epsilon, k-omega and Reynolds Stress) are considered for simulation of boiling heat transfer and CHF phenomenon. The highest accuracy of simulation is obtained by k-epsilon model. The results express that the wall temperature value of tube with adiabatic and heated boundary conditions for first and second half of the tube is lower than the wall temperature when the fluid flows only in the heated wall section. Reduction of velocity value also leads to reduction of maximum wall temperature value and CHF value. Decreasing Roughness value as an effective parameter leads to an increase in wall temperature. Maximum value of the wall temperature, after CHF point, also increases with increase in heat flux value. CHF depends on the surface roughness and rises with increasing roughness value.

show abstract

Section: Validationsupporting

confidence: 82%

Section: Validationmentioning

confidence: 66%

Section: Validationmentioning

confidence: 66%

See 1 more Smart Citation

Prediction of critical heat flux in flow boiling process under the effect of different operating parameters

Abedini

Behboudi

Karachi

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

show abstract

“…To detect CHF through numerical simulation, there were usually several methods. Zhang et al [27] predicted CHF based on the rapid increase of local wall temperature with ANSYS FLUENT. Ashouri et al [28] numerically investigated turbulent force convective heat transfer of water-based Al 2 O 3 nanofluid flowing through the CuCrZr cooling tube of a small scale of mock up made of five tungsten monoblocks using single phase model.…”

Section: Cfd Simulation Resultsmentioning

confidence: 99%

Critical heat flux analysis of divertor cooling flow channel in fusion reactor with CFD method

Wang

Guo

et al. 2022

THERM SCI

View full text Add to dashboard Cite

Situated at the bottom of the vacuum vessel, the divertor extracts heat and ash produced by the fusion reaction, minimizes plasma contamination, and protects the surrounding walls from thermal and neutronic loads. The vertical targets of divertor are designed to be able for up to 20 MW/m2 high heat flux. It is a great ordeal for both the material performance and the cooling ability. Critical heat flux (CHF) margin is very crucial during the design of divertor. ANSYS FLUENT is used in this paper to predict the CHF on a monoblock structure with a twisted tape inside the tube. Numerical results are validated with the corresponding sets of experimental results. In this paper, CFD method used to predict CHF of divertor cooling channel was first introduced. On the other hand, influence of inlet subcooling on CHF is studied in detail. The inlet subcooling affect the CHF much complicated for the single- side heated and swirl flow channel. Whether the influencing trend or the locations of CHF occurrence are different under different inlet subcooling. The derivations between the simulation and experimental results were no more than 32%. This study proves the CFD tools can provide efficient help on the understanding of the CHF phenomenon of complex construction.

show abstract

“…The CFD simulation on subcooled boiling flow was carried out using the commercial code FLUENT. Eulerian-Eulerian twofluid model along with the interphase actions and wall boiling models used in FLUENT has been validated in our previous work (Zhang et al, 2015c). Besides, the sensitivities of the turbulence model, the mesh size and the near wall turbulence treatment have been studied (Krepper and Rzehak, 2012;Zhang et al, 2015b).…”

Section: Implementation Of the Uncertainty Analysismentioning

confidence: 99%

Investigation on the Subcooled Boiling in Vertical Pipe With Uncertainties From Boundary Conditions by Using FLUENT

Zhang

et al. 2018

Front. Energy Res.

Self Cite

View full text Add to dashboard Cite

Subcooled boiling flow taking place in the reactor system plays a critical role in the safety of nuclear power plants. It has been studied by experiments and system codes in the past decades. Now subcooled boiling can be predicted with CFD code based on the Eulerian two-fluid model, with the development in the computational technology and the understanding in the mechanism of two-phase flow. The published works on the validation of CFD code for two-phase flow were carried out based on the deterministic analysis by comparing the calculated and experimental nominal inputs and outputs, which is not sufficient for code validation since it didn't consider the inevitable uncertainty in the experiment measurements. In the current work, subcooled boiling was predicted by using a CFD code, FLUENT, with consideration of the uncertainties of boundary conditions. The resultant parameters with uncertainties were compared to the experiment data for validation purpose. Confidence intervals of the two-phase parameters were predicted. Besides, correlations between the boundary conditions and the outputs were analyzed.

show abstract

Prediction of CHF in vertical heated tubes based on CFD methodology

Cited by 54 publications

References 11 publications

Prediction of critical heat flux in flow boiling process under the effect of different operating parameters

Prediction of critical heat flux in flow boiling process under the effect of different operating parameters

Critical heat flux analysis of divertor cooling flow channel in fusion reactor with CFD method

Investigation on the Subcooled Boiling in Vertical Pipe With Uncertainties From Boundary Conditions by Using FLUENT

Contact Info

Product

Resources

About