Our Chemie Diaries

Our Chemie Diaries

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By Bojanna Shantheyanda, Sreya Dutta, Kevin Coscia and David SchiemerDynalene, Inc. Fluid cooling, which can be accomplished using indirect or direct means, is used in electronics applications having thermal power densities that may exceed safe dissipation with air cooling. Indirect liquid air conditioning is where warm dissipating digital components are physically divided from the liquid coolant, whereas in situation of straight cooling, the components remain in direct call with the coolant.


Nonetheless, in indirect cooling applications the electric conductivity can be essential if there are leakages and/or splilling of the fluids onto the electronics. In the indirect cooling applications where water based liquids with corrosion inhibitors are normally made use of, the electric conductivity of the liquid coolant mostly depends on the ion concentration in the liquid stream.


The boost in the ion concentration in a shut loophole fluid stream may take place because of ion seeping from metals and nonmetal parts that the coolant fluid touches with. During operation, the electric conductivity of the liquid might boost to a degree which can be harmful for the cooling system.

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(https://chemie999.edublogs.org/2025/01/09/dielectric-coolant-the-key-to-efficient-heat-transfer-in-modern-systems/)They are bead like polymers that can trading ions with ions in an option that it is in contact with. In the existing work, ion leaching tests were done with various metals and polymers in both ultrapure deionized (DI) water, i.e. water which is dealt with to the greatest levels of pureness, and reduced electric conductive ethylene glycol/water blend, with the gauged adjustment in conductivity reported over time.


The samples were permitted to equilibrate at space temperature for 2 days before videotaping the preliminary electrical conductivity. In all tests reported in this research liquid electric conductivity was measured to a precision of 1% using an Oakton CON 510/CON 6 collection meter which was adjusted prior to each dimension.

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from the wall surface heating coils to the center of the heater. The PTFE sample containers were placed in the heating system when steady state temperature levels were gotten to. The examination setup was removed from the heating system every 168 hours (7 days), cooled to area temperature level with the electric conductivity of the liquid gauged.


The electrical conductivity of the fluid sample was kept track of for an overall of 5000 hours (208 days). Number 2. Schematic of the indirect shut loop cooling down experiment set-up - silicone synthetic oil. Table 1. Components made use of in the indirect shut loop cooling experiment that touch with the fluid coolant. A schematic of the experimental configuration is shown in Figure 2.


Prior to commencing each experiment, the test configuration was rinsed with UP-H2O a number of times to eliminate any type of contaminants. The system was loaded with 230 ml of UP-H2O and was permitted to equilibrate at room temperature for an hour before tape-recording the initial electric conductivity, which was 1.72 S/cm. Liquid electrical conductivity was gauged to a precision of 1%.

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The change in liquid electrical conductivity was monitored for 136 hours. The fluid from the system was collected and stored.


Table 2. Test matrix for both ion leaching and indirect shut loop cooling experiments. Table 2 reveals the test matrix that was made use of for both ion leaching and closed loophole indirect air conditioning experiments. The adjustment in electric conductivity of the fluid examples when stirred with Dowex combined bed ion exchange resin was determined.


0.1 g of Dowex resin was included in 100g of fluid samples that was absorbed a separate container. The combination was stirred and transform in the electric conductivity at room temperature was determined every hour. The measured modification in the electric conductivity of the UP-H2O and EG-LC test fluids consisting of polymer or metal when involved for 5,000 hours at 80C is shown Number 3.

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Ion leaching experiment: Measured modification in electric conductivity of water and EG-LC coolants having either polymer or steel examples when submersed for 5,000 hours at 80C. The outcomes show that steels added less ions right into the fluids her response than plastics in both UP-H2O and EG-LC based coolants.




Fluids including polypropylene and HDPE showed the most affordable electric conductivity adjustments. This could be as a result of the brief, stiff, straight chains which are less most likely to add ions than longer branched chains with weak intermolecular pressures. Silicone also performed well in both test fluids, as polysiloxanes are normally chemically inert due to the high bond energy of the silicon-oxygen bond which would protect against degradation of the material right into the liquid.

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It would be anticipated that PVC would certainly generate comparable outcomes to those of PTFE and HDPE based on the comparable chemical structures of the products, nevertheless there might be various other contaminations existing in the PVC, such as plasticizers, that might affect the electrical conductivity of the fluid - high temperature thermal fluid. Additionally, chloride teams in PVC can additionally leach right into the test liquid and can create an increase in electric conductivity


Buna-N rubber and polyurethane revealed indicators of destruction and thermal decay which recommends that their feasible energy as a gasket or sticky material at higher temperatures might cause application concerns. Polyurethane entirely broke down into the examination fluid by the end of 5000 hour test. Figure 4. Before and after photos of metal and polymer samples immersed for 5,000 hours at 80C in the ion leaching experiment.


Calculated modification in the electric conductivity of UP-H2O coolant as a feature of time with and without resin cartridge in the closed indirect air conditioning loophole experiment. The gauged adjustment in electric conductivity of the UP-H2O for 136 hours with and without ion exchange resin in the loophole is revealed in Number 5.

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