scholarly journals Replica of Sink Ability Test with Beeker Test

2020 ◽  
Vol 3 (12) ◽  
pp. 92-94
Author(s):  
Sreenivasa Rao Pagolu
Keyword(s):  
Surface Tension ◽  
Quality Control ◽  
Low Temperature ◽  
Winter Season ◽  
Ability Test ◽  
Control Team ◽  
Break Surface ◽  
New Formulation

The sink-ability test is to be carried out frequently for the pellets made during winter season, since surface tension of water during low temperature is high. Pellets have to break surface tension to sink into the water. This test will be carried out morning hours at around 6:00 Am at ponds. During every startup of production or during new formulation, this test is mandatory. Normally ponds are away from factory, carrying out of this test is became a big issue to the quality control team to confirm the sink ability. This is to be made easy by making replica of pond test.

Comparison of analytical methods for the quality control of a new formulation containing soy extract and melatonin

2008 ◽  
Vol 31 (10) ◽  
pp. 1851-1859 ◽  
Author(s):  
Maria Addolorata Saracino ◽  
Laura Mercolini ◽  
Alessandro Musenga ◽  
Francesca Bugamelli ◽  
Maria Augusta Raggi
Keyword(s):  
Quality Control ◽  
Analytical Methods ◽  
New Formulation ◽  
Comparison Of Analytical Methods

Quality Control of Bond Strength in Low-Temperature Bonded Wafers

2013 ◽  
Vol 50 (7) ◽  
pp. 253-262
Author(s):  
J. Siegert ◽  
C. Cassidy ◽  
F. Schrank ◽  
R. Gerbach ◽  
B. Boettge ◽  
...  
Keyword(s):  
Quality Control ◽  
Low Temperature ◽  
Bond Strength

Modification of the CO2 surface tension calculation model under low-temperature and high-pressure condition

2016 ◽  
Vol 38 (5) ◽  
pp. 671-676 ◽  
Author(s):  
Wenming Jiang ◽  
Jiang Bian ◽  
Yang Liu ◽  
Song Gao ◽  
Mingcan Chen ◽  
...  
Keyword(s):  
Surface Tension ◽  
High Pressure ◽  
Low Temperature ◽  
Calculation Model ◽  
Pressure Condition

Condensation of Low-Surface-Tension Fluids on Microstructured Surfaces at Low Temperature

2017 ◽  
Author(s):  
Abulimiti Aili ◽  
Qiaoyu Ge ◽  
TieJun Zhang
Keyword(s):  
Heat Transfer ◽  
Surface Tension ◽  
Low Temperature ◽  
High Surface ◽  
Condensation Heat Transfer ◽  
Lubricant Oil ◽  
Microstructured Surfaces ◽  
Performance Deterioration ◽  
Coated Surface ◽  
Coated Surfaces

Filmwise condensation of a low surface tension fluid (i.e. refrigerant) on microstructured aluminum surfaces is studied to investigate the effect of the structures on condensation heat transfer at low temperature. The hypothesis is that the structures may cause thinning of the condensate film at micro-scales, thus resulting in an enhancement of condensation heat transfer. However, the structures may also decrease the mobility of the condensate near the surface due to increased friction, thus potentially leading to performance deterioration. The aim of this work is to investigate which of the two counteracting mechanisms dominate during filmwise condensation. Condensation experiments are carried out in a low-temperature vacuum chamber. Compared with the Nusselt model of condensation, the microstructured surfaces, either coated or uncoated, show similar performance, with potentially slight enhancement at low subcooling degree and slight deterioration at high subcooling degree. When the microstructured and silane-coated surface is infused with a non-volatile and very low-surface-tension lubricant oil, the lubricant is displaced by the condensate and there is almost no change in the condensation performance. Our results show that, unlike the case of dropwise condensation of high-surface tension fluids, microstructured and coated surfaces with/without infusing oil is not exciting to enhanced filmwise condensation of low-surface-tension fluids.

scholarly journals Exergy Analyses of Low-Temperature District Heating Systems With Different Sanitary Hot-Water Boosters

Entropy ◽  
2019 ◽  
Vol 21 (4) ◽  
pp. 388
Author(s):  
Poredoš ◽  
Kitanovski ◽  
Poredoš
Keyword(s):  
Low Temperature ◽  
Winter Season ◽  
District Heating ◽  
Intersection Point ◽  
Exergy Efficiency ◽  
Hot Water ◽  
Heating Systems ◽  
District Heating Systems ◽  
Different Types ◽  
Exergy Analyses

This paper presents an exergy-efficiency analysis of low-temperature district heating systems (DHSs) with different sanitary hot-water (SHW) boosters. The required temperature of the sanitary hot water (SHW) was set to 50 °C. The main objective of this study was to compare the exergy efficiencies of a DHS without a booster to DHSs with three different types of boosters, i.e., electric-, gas-boiler- and heat-pump-based, during the winter and summer seasons. To achieve this, we developed a generalized model for the calculation of the exergy efficiency of a DHS with or without the booster. The results show that during the winter season, for a very low relative share of SHW production, the DHS without the booster exhibits favorable exergy efficiencies compared to the DHSs with boosters. By increasing this share, an intersection point above 45 °C for the supply temperatures, at which the higher exergy efficiency of a DHS with a booster prevails, can be identified. In the summer season the results show that a DHS without a booster at a supply temperature above 70 °C achieves lower exergy efficiencies compared to DHSs with boosters at supply temperatures above 40 °C. The results also show that ultra-low supply and return temperatures should be avoided for the DHSs with boosters, due to higher rates of entropy generation.

scholarly journals Research on Physico-Chemical Properties of Diethyl Ether/Linseed Oil Blends for the Use as Fuel in Diesel Engines

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6564
Author(s):  
Krzysztof Górski ◽  
Ruslans Smigins ◽  
Rafał Longwic
Keyword(s):  
Surface Tension ◽  
Low Temperature ◽  
Diethyl Ether ◽  
Diesel Fuel ◽  
Diesel Engines ◽  
Kinematic Viscosity ◽  
Linseed Oil ◽  
Chemical Properties ◽  
Fuel Blends ◽  
Physico Chemical

Physico-chemical properties of diethyl ether/linseed oil (DEE/LO) fuel blends were empirically tested in this article for the first time. In particular, kinematic viscosity (ν), density (ρ), lower heating value (LHV), cold filter plugging point (CFPP) and surface tension (σ) were examined. For this research diethyl ether (DEE) was blended with linseed oil (LO) in volumetric ratios of 10%, 20% and 30%. Obtained results were compared with literature data of diethyl ether/rapeseed oil (DEE/RO) fuel blends get in previous research in such a way looking on differences also between oil types. It was found that DEE impacts significantly on the reduction of plant oil viscosity, density and surface tension and improve low temperature properties of tested oils. In particular, the addition of 10% DEE to LO effectively reduces its kinematic viscosity by 53% and even by 82% for the blend containing 30% DEE. Tested ether reduces density and surface tension of LO up to 6% and 25% respectively for the blends containing 30% DEE. The measurements of the CFPP showed that DEE significantly improves the low temperature properties of LO. In the case of the blend containing 30% DEE the CFPP can be lowered up to −24 °C. For this reason DEE/LO blends seem to be valuable as a fuel for diesel engines in the coldest season of the year. Moreover, DEE/LO blends have been tested in the engine research. Based on results it can be stated that the engine operated with LO results in worse performance compared with regular diesel fuel (DF). However, it was found that these disadvantages could be reduced with DEE as a component of the fuel mixture. Addition of this ether to LO improves the quality of obtained fuel blends. For this reason, the efficiency of DEE/LO blend combustion process is similar for the engine fuelled with regular diesel fuel. In this research it was confirmed that the smoke opacity reaches the highest value for the engine fuelled with plant oils. However, addition of 20% DEE reduces this emission to the value comparable for the engine operated with diesel fuel.

Determination of surface tension and surface thermodynamic properties of nano-ceria by low temperature heat capacity

2020 ◽  
Vol 518 ◽  
pp. 112627
Author(s):  
Zixiang Cui ◽  
Jiaojiao Chen ◽  
Yongqiang Xue ◽  
Junzhen Gan ◽  
Xinghui Chen ◽  
...  
Keyword(s):  
Surface Tension ◽  
Heat Capacity ◽  
Low Temperature ◽  
Thermodynamic Properties ◽  
Temperature Heat ◽  
Low Temperature Heat Capacity ◽  
Nano Ceria

scholarly journals A Novel Method for Improving Low-Temperature Flotation Performance of Nonpolar Oil in the Molybdenite Flotation

Minerals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 609 ◽  
Author(s):  
Wan ◽  
Qu ◽  
Li ◽  
He ◽  
Bu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Surface Tension ◽  
Low Temperature ◽  
Interfacial Tension ◽  
Field Intensity ◽  
Magnetic Field Intensity ◽  
Maximum Surface ◽  
Flotation Recovery ◽  
Flotation Performance ◽  
The Magnetic Field

Nonpolar hydrocarbon oil (NHO) is one of the most extensively used collectors in the flotation of molybdenite due to its excellent selectivity. However, NHO has low sensibility at pulp temperature. At low temperatures (<283 K), although more kerosene is used, the recovery of molybdenite flotation is still lower than at room temperature. In this study, magnetizing treatment, which is an efficient, low-cost, innovative, and environmentally friendly emulsification method, was used to improve the flotation performance of NHO in low-temperature molybdenite flotation. The test results showed that, compared with unmagnetized kerosene (UMK), the optimum dosage of magnetized kerosene (MK) could be reduced by 11% at 298 K. At the same dosage of kerosene, the flotation recovery of MK was 3% higher than UMK at 278 K. The surface tension measurement results showed that the surface tension of MK rose periodically as the magnetic field intensity increased, and there was a maximum surface tension within each period. Further, the magnetic field intensity had the maximum flotation recovery of molybdenite at the maximum surface tension of MK. Combined with the analysis based on the Girifalco–Good theory and the static drop volume method of interfacial tension, the interfacial tension of kerosene–water was shown to decrease with the increase of the surface tension of kerosene. This finding indicates that the dispersibility of kerosene in pulp could be improved by reducing the size of oil droplets, thereby improving the molybdenite flotation recovery of kerosene at low-temperature pulp. It is helpful to improve the flotation recovery of molybdenite using NHO as a collector for low-temperature pulp (<283 K).

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