IEEE Spectrum’s Post

This was a fun project! We used an optical iris to achieve a variable area jet impingement nozzle. The study dives into the experimental methods to create pulsating flow in a liquid environment and arrives at a parametric spatially-averaged Nusselt number model. An additional benefit of the active nozzle is enabling the thermal management system to respond to power fluctuations and maintain a more constant device temperature, which inherently improves reliability. Not shown in this work but included in my dissertation are efforts to apply the active nozzle to EPA drive schedules to reduce pressure drop and improve thermal stability. Dynamic mesh CFD modelling was also used to determine the frequency at which nonlinear effects appear in the jet flow, leading to enhanced heat transfer.

✨ Proximity Effect in Conductors: Which Losses Model to use? ✨ 📜 Proximity effect in conductors are due to an external magnetic field that induces eddy currents. These eddy currents generate losses named 'Proximity Effect Losses' or 'Strand-Level Proximity-Effect Losses'. Resulting losses can be significant in windings of electric machines especially at high speed operation, which can be a concern of machines used in the automotive industry. Proximity Effect Losses can be mitigated through different solutions, mainly conductor's diameter and winding configurations. Evaluating these losses is therefore an essential task. Our Postdoctoral Researcher Taha EL HAJJI performed a detailed research review to list and classify the main models in the literature allowing for evaluation of proximity effect losses in conductors for both circular and rectangular shapes. The article reviews also models of other high frequency effects (skin effect and circulating currents) and information on winding configurations. 🌐 Link to the review article (Open Access): https://lnkd.in/ebK4iFiJ #proximityeffect #electricalmachines #highfrequency #electricmotors #highspeed #electricvehicles

Using berry phase monopole engineering for high-#temperature #spintronic devices. https://lnkd.in/gY-Tyrdq

Did you know that one of the most precise methods for measuring low resistance was invented over 150 years ago? 🌟 Kelvin Double Bridge 🌟 - a device that changed the game for electrical engineers! 🔍 Why It’s Fascinating: Precision Engineering ➡️ With a four-wire setup, it effectively eliminates the pesky errors caused by lead resistance. Historical Context ➡️ Developed by Lord Kelvin in 1886, this bridge symbolizes the blend of engineering and science even today. Real-World Impact ➡️ From calibrating sensitive instruments to quality control in electronics manufacturing, the Kelvin Double Bridge ensures that what we measure is exactly what we get—no more, no less! This elegant piece of technology not only showcases human ingenuity but also reminds us that some of the best solutions are rooted in the past.

By adding #graphene to copper wiring, it may be possible to improve the electrical conductivity of #electricmotors even when operating at higher temperatures which would enable efficiency gains according to new research from the DOE's Pacific Northwest National Laboratory. #motioncontrol #electrification #research #researchanddevelopment #engineering #design #technology #materialsresearch U.S. Department of Energy (DOE) Pacific Northwest National Laboratory Power & Motion

Exciting news to share! My paper on "The speed control of BLDC Motor using LUO CONVERTER" has been published in the International Research Journal of Engineering and Technology. Thankful for this recognition! #Engineering #Technology #ResearchPublished

Exciting News!! Glad to share that my article titled "Mitigation of electric vehicles impact on grid current harmonics using DERs" is published in Scopus indexed journal "Australian Journal of Electrical and Electronics Engineering". https://lnkd.in/g8ZXuuup

⚠ Safety is a paramount consideration when it comes to manufacturing lithium-ion #batteries. We have all seen the videos of a car battery exploding or a cell phone catching fire in someone's hand. This is due to thermal runaway: when the temperature of a battery increases quickly, causing it to release its energy in grand fashion. In battery packs, a thermal runaway event could propagate to neighboring battery cells, causing a rapidly proliferating chain reaction. Thankfully, #ALDep is an excellent way to use high energy battery materials and protect cells from thermal runaway events. Check out this work we did with Acculon showing how ALD-coated battery cells are prevented from thermal runaway events and propagation from neighboring cells: https://lnkd.in/d9pjxXJ4 Don't forget to follow Forge Nano, Inc. to keep updated on our efforts to shift the paradigm in battery manufacturing with ALD. The next article on Li-ion batteries comes out on May 7th!

The immersion-cooled cell-to-chassis battery. Another exciting topic in battery development.   Immersion cooling is now being pursued by some manufacturers; it simply offers better control/regulation of the battery/cell temperature, as the cell is largely completely surrounded with coolant, as opposed to cooling plates and cooling only on a small area on one or two sides.   The optimum temperature is e.g. positive for power consumption and output (charging/discharging), utilization of the available capacity and also has a positive effect on ageing (just to name some).   Depending on the approach, however, more space is needed between the cells, which in turn leads to less energy density at module or pack level.    This can be compensated for with the CTC or CTS (cell to chassis/cell to structure) approach, as this increases the energy density at battery level again.   In my opinion, finding the right balance, energy management, is the key to achieving the best efficiency and the best properties for the customer.   That's where engineering is really fun and I like functional development (considers mechanics, hardware and software). https://lnkd.in/dfjSN-V6   #battery #development #energy

Spintronic devices are electronic devices that utilize the spin of electrons (an intrinsic form of angular momentum possessed by the electron) to achieve high-speed processing and low-cost data storage. In this regard, spin-transfer torque is a key phenomenon that enables ultrafast and low-power spintronic devices. Recently, however, spin-orbit torque (SOT) has emerged as a promising alternative to spin-transfer torque.