thermal circulation
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Geothermics ◽  
2019 ◽  
Vol 78 ◽  
pp. 154-169 ◽  
Author(s):  
Bérénice Vallier ◽  
Vincent Magnenet ◽  
Jean Schmittbuhl ◽  
Christophe Fond

2015 ◽  
Vol 72 (6) ◽  
pp. 2484-2506 ◽  
Author(s):  
Chun-Chih Wang ◽  
Daniel J. Kirshbaum

Abstract Observations from the Dominica Experiment (DOMEX) and cloud-resolving numerical simulations are used to study a thermally forced convection event over the Caribbean island of Dominica on 18 April 2011. A clear diurnal cycle of island thermal forcing and cumulus convection was observed, with cumuli initiating over the southwestern flank of the ridge and deepening as they drifted eastward. Apart from errors in cloud fraction and (notably) precipitation, the simulations verified well against the observations, provided horizontal grid spacings of 500 m or less were used. The simulated flows developed an island-scale solenoidal circulation with an organized and intense updraft over the ridge that focused convective initiation. Sensitivity tests investigated the impacts of topographic forcing, subcloud winds, and cloud–radiative feedbacks on the island-scale horizontal inflow and cloud vertical mass flux. These experiments confirmed that thermal forcing drove the island convection and that the inflow and cloud mass flux were maximized under weak ambient cross-island winds. The simulations also indicated that cloud shading and precipitation each reduced the island inflow by ~20% while cloud latent heat release enhanced it by ~20%. However, precipitation caused a much smaller reduction in cloud mass flux (10%) than did cloud shading (50%) owing to effective secondary convective initiation by subcloud cold pools. Thermodynamic heat-engine theory provided accurate predictions of the simulated solenoidal updraft magnitudes in selected cases. It also provided a simple explanation for the weakening of the simulated thermal circulation in the presence of island orography: a shallower mixed layer reduced the efficiency of the thermal circulation.


2015 ◽  
Vol 741 ◽  
pp. 453-457
Author(s):  
Lin Sha ◽  
Hai Zhu

In this paper, based on the analysis of the heating system defects of a certain type of vehicle engine, the cooling heating system has been simplified and the calculation of the automatic heating process is determined. The time and temperature of the automatic heating in the large circulation condition is calculated. According to the improved proposal, the time and temperature of the automatic heating in the small circulation condition is calculated. The charting data is provided and comparison with the large circulation is analyzed. The theoretical and technical support is provided to improve the engine heating system and lays the foundation to implement the improved scheme.


2014 ◽  
Vol 80 ◽  
pp. 184-191 ◽  
Author(s):  
Ann Dallman ◽  
S. Magnusson ◽  
R. Britter ◽  
L. Norford ◽  
D. Entekhabi ◽  
...  

2011 ◽  
Vol 239-242 ◽  
pp. 1101-1104
Author(s):  
Jing Guo ◽  
Heng Xue Xiang ◽  
Cheng Nv Hu

Using stearic acid-lauric acid binary of fatty acid as phase change material, waste polyacrylonitrile fiber (PAN) as supporting material, organic montmorillonite (OMMT) as modifier, and N, N-dimethylformamide as solvent, OMMT-PAN-binary fatty acid composite phase change materials(PCM) is prepared by solution blending. Using Scanning Electron Microscopy (SEM), Differential Scanning Calorimetry (DSC), Thermogravimetric analysis (TG) study the structure and properties of PCM, the optimized preparation techniques of PCM obtained by orthogonal tests. SEM results showed that the PCM was homogeneous structure, binary of fatty acid dispersed in the continuous phase PAN; TGA results indicated that the degradation of the phase change material can be divided into three steps; DSC results showed that the crystallization enthalpy of PCM reached 143.27 J/g, the phase change temperature was around 23°C, and the DSC thermal circulation showed good thermal stability of the PCM; cooling curve showed that the PCM had good heat insulation properties, holding time reached 800s, and after repeated thermal circulation, heat insulation properties remained the same.


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