Phase-Change Composites Composed of Silicone Rubber and Pa@SiO2@PDA Double-Shelled Microcapsules with Low Leakage Rate and Improved Mechanical Strength

2021 ◽  
Author(s):  
Hao Deng ◽  
Yunmiao Yang ◽  
Xiaohong Tang ◽  
Yongsheng Li ◽  
Fangfang He ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Phase Change ◽  
Silicone Rubber ◽  
Leakage Rate ◽  
Low Leakage ◽  
Phase Change Composites

Phase Change in Liquid Face Seals II—Isothermal and Adiabatic Bounds With Real Fluids

1980 ◽  
Vol 102 (3) ◽  
pp. 350-357 ◽  
Author(s):  
W. F. Hughes ◽  
N. H. Chao
Keyword(s):  
Thermodynamic Properties ◽  
Phase Change ◽  
Leakage Rate ◽  
Operating Conditions ◽  
Isothermal Model ◽  
Reynolds Number Flow ◽  
Low Leakage ◽  
Real Fluid ◽  
Face Seals ◽  
Liquid Yield

Phase change effects in parallel and tapered liquid face seals are studied analytically. Both an isothermal and adiabatic model of low Reynolds number flow are considered by numerical integration of the descriptive equations for a real fluid. Real fluid thermodynamic properties are calculated for each step, using a computer program for the steam tables or thermodynamic properties of the fluid considered. Examples are presented for water. The general conclusions are: 1. For low leakage rate the isothermal model is more accurate and for high leakage rates the adiabatic model is more accurate. 2. Both parallel models, ordinarily neutrally stable with a liquid, yield the same general conclusions about stability. If the sealed fluid is near enough to saturation conditions, there will exist generally two values of the film gap, h, which yield the same separating force under a given set of operating conditions. For a given speed, face excursions about the larger value are stable, but excursions about the lower value are unstable, either growing to the larger h if displaced apart or collapsing if displaced together. 3. The transient of collapse is described by the adiabatic model which predicts a catastrophic collapse and then either failure or explosive return to a larger value of h. 4. Converging seals (ordinarily stable with a liquid at some given value of h) may become unstable, the phase change effect dominating the behavior and giving rise to collapse as described above. 5. The mass leakage rate is reduced significantly below the all liquid value when boiling occurs.

Multifunctional silicone rubber/paraffin@ PbWO 4 phase‐change composites for thermoregulation and gamma radiation shielding

2020 ◽  
Vol 44 (9) ◽  
pp. 7674-7686 ◽  
Author(s):  
Lan Lou ◽  
Zhiyu He ◽  
Yingjun Li ◽  
Yongsheng Li ◽  
Yuanlin Zhou ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Phase Change ◽  
Silicone Rubber ◽  
Radiation Shielding ◽  
Phase Change Composites

GO modified EPDM/paraffin shape-stabilized phase change materials with high elasticity and low leakage rate

Polymer ◽  
2020 ◽  
Vol 204 ◽  
pp. 122824 ◽  
Author(s):  
Ze Ding ◽  
Wenbin Yang ◽  
Fangfang He ◽  
Zhuoni Jiang ◽  
Ren He ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Leakage Rate ◽  
Low Leakage ◽  
High Elasticity

Novel Shape-Stabilized Phase Change Materials Based on Paraffin/EPDM@Graphene with High Thermal Conductivity and Low Leakage Rate

2020 ◽  
Vol 34 (4) ◽  
pp. 5024-5031 ◽  
Author(s):  
Ze Ding ◽  
Fangfang He ◽  
Yongsheng Li ◽  
Zhuoni Jiang ◽  
Hongjian Yan ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Phase Change ◽  
Phase Change Materials ◽  
Leakage Rate ◽  
High Thermal Conductivity ◽  
Low Leakage

scholarly journals Fabrication of Three-Dimensional Copper@Graphene Phase Change Composite with High Structural Stability and Low Leakage Rate

2021 ◽  
Vol 0 (0) ◽  
pp. 2012091-0
Author(s):  
Xiaoming Li ◽  
Yidan Gao ◽  
Qingqiang Kong ◽  
Lijing Xie ◽  
Zhuo liu ◽  
...  
Keyword(s):  
Phase Change ◽  
Structural Stability ◽  
Three Dimensional ◽  
Leakage Rate ◽  
Low Leakage ◽  
High Structural Stability

Study on Leakage Rate of HDPE/Paraffin Composite for Phase Change Materials

2012 ◽  
Vol 549 ◽  
pp. 766-769
Author(s):  
Huan Rui Liu ◽  
Wen Bin Yang ◽  
Xin Yi Pu ◽  
Kai Zhang
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
High Density Polyethylene ◽  
Phase Change Materials ◽  
Mixing Time ◽  
Leakage Rate ◽  
Energy Storage Materials ◽  
Low Leakage ◽  
Rate Of Cooling ◽  
Different Content

Based on high density polyethylene (HDPE) as supporting and encapsulating materials, paraffin wax as energy storage materials, HDPE/paraffin composite for phase change materials was prepared in the paper. In order to low leakage rate of HDPE/paraffin composite for phase change materials, the influencing factors of leakage rate of HDPE/paraffin composite, such as temperature of mixing, time of mixing, different content of DCP, rate of cooling, were studied. The results indicated that low leakage rate of PCM could be prepared.

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