Articles tagged with Convection
Researchers at Arizona State University have discovered an overlooked physical process that significantly impacts sweat's cooling effect in hot, dry environments. The study found that temperature and humidity can create an opposing upward flow near the skin, canceling out airflow and increasing body heat storage.
Researchers at Pohang University of Science & Technology experimentally demonstrated the existence of nanometer-sized liquid clusters in supercritical fluids, overturning the prevailing notion of a single phase. These clusters persisted for up to an hour and have significant implications for industrial processes and natural environments.
Southwest Research Institute (SwRI) is expanding its heat exchanger testing capabilities to include megawatt-scale performance evaluations. This move addresses a significant market gap for high-heat transfer rates involving high-temperature and -flowrate applications in data centers, defense, and other fields.
Researchers at Washington University in St. Louis propose a new mechanism to explain Venus' geology: convection in the crust. If true, this process could influence volcano placement and type. High-resolution gravity measurements could detect differences in crust temperature and density.
Two large 'islands' with the size of a continent have been found in the Earth's mantle, showing they are at least half a billion years old. Seismologists discovered these regions by studying the tones and sound volume of seismic waves, finding little damping in the islands, but high damping in nearby cold slab graveyard.
Researchers argue that the planets' unique magnetic fields can be explained by immiscible layers of water and hydrocarbons. Computer simulations show that a combination of water, methane, and ammonia separates into two distinct layers under extreme temperatures and pressures.
The PICCOLO project aims to improve understanding of clouds and convective storms in the tropics, with the ORCESTRA campaign utilizing sea-borne and air-borne teams to collect data. Researchers collected detailed information on precipitation, cloud microphysics, and convective dynamics.
The study reveals that supergranules, a flow structure in the sun's interior, challenge standard theories of solar convection. Researchers discovered that downflows appear weaker than upflows, suggesting an unseen component that could be small-scale plumes transporting cooler plasma into the sun's interior.
Researchers found isolated deep convection (IDCs) mainly concentrate in the southern Tibetan Plateau, with an average of 54.2 IDCs per rainy season. IDCs contribute up to 70% of extreme precipitation in July and August, highlighting their significant role in regional weather patterns.
A University of Oklahoma-led study highlights newly measured extremes in stratospheric water vapor recorded during the DCOTSS field project. High-level thunderstorms enhance water vapor in the stratosphere at levels higher than previously understood.
A research team led by Yongjie Huang is exploring the complex interactions between convective clouds and their surrounding environments. They aim to understand how convection initiates and how convective cells interact with their environment, ultimately improving computer models for forecasting.
A Northwestern University-led team developed the first 3D simulations of energy rippling from a massive star's core to its outer surface. The researchers determined how much stars should innately twinkle and converted these waves into sound waves, allowing listeners to hear both what the insides of stars and their twinkling sound like.
Researchers believe convection in the mantle was stratified into two distinct layers, isolated from each other, until a phase transition at 660 km depth. This restriction to upper mantle recycling and mixing has implications for our understanding of Earth's primordial composition.
Millimeter-sized droplets can be levitated for long periods using solutocapillary convection within a pool of silicone liquid, allowing researchers to study the activity of viruses and microorganisms in airborne aerosols. This phenomenon has potential applications in microbiology and biochemistry.
Researchers found turbulent convection powers flows with solid bodies, moving in two directions and rotating together. The study sheds light on the interaction between fluids and solids, offering insights into Earth's inner core and thermal convection.
Researchers find that changes in wind patterns caused by warmer tropical waters are steering storms closer to the US East and Gulf coasts, increasing risk for residents. The study reveals that this phenomenon is linked to stronger hurricane frequency due to climate change.
Frontal polymerization, a faster and more energy-efficient process, generates heat that drives natural convection. This interaction leads to patterns in the resulting solid polymeric material, affecting its properties.
Researchers from the University of Illinois have developed a new theory that explains how convection occurs inside reactive porous media, shedding light on mass and heat transfer principles. The theory introduces a spectral Sherwood number and extends Newton's law of cooling for convection heat transfer to transient conditions.
Researchers have discovered that convection of saline water beneath the surface is responsible for the formation of hexagonal honeycomb patterns in salt deserts. The consistent size and shape of these patterns can be attributed to the unique combination of temperature, salinity, and groundwater flow.
The study reveals that the Tropical easterly jet significantly modulates tropical cyclone genesis over the western North Pacific. The intensified WP_TEJ results in strong northerly winds, inducing large-scale divergence and upward motion that favors deep convection and TC formation.
University of Houston engineers Jiming Bao and Feng Lin create upward fountains in deep water by shining laser beams on the surface, attributing the phenomenon to the Marangoni effect. The discovery has potential applications in lithography, 3D printing, heat transfer, and microfluidics.
Researchers developed kirigami-processed cellulose nanofiber films that dramatically improve cooling functionality, reducing thermal resistance by about one-fifth. These films can be used to create new cooling devices for wearable electronics, addressing bulkiness and inflexibility issues.
A new study finds that model biases in simulating tropical climate trends can significantly impact projections of extreme El Niô frequency change. By removing the impacts of these biases, researchers conclude that the extreme El Niô frequency is likely to remain unchanged in the future, contrary to original projections.
Convection may be to blame for stuck-on food in nonstick pans due to temperature gradients and surface tension changes. Researchers determined conditions that lead to dry spots, including decreasing film thickness and size of deformed region below critical values.
High aerosol concentrations increase environmental humidity by producing more clouds, which can mix condensed water into the surrounding air. This humidification enhances updraft speeds, intensifying thunderstorms.
Researchers discovered that mantle convection on early Earth was surprisingly slow and spatially restricted until around 3 billion years ago. This finding suggests that the onset of modern plate tectonics triggered the emergence of large continental masses and an oxygen-rich atmosphere, setting the stage for complex life.
Tropical Depression 19E formed into Tropical Storm Norbert, while Marie weakened and declined. Norbert is moving northwestward with maximum sustained winds near 45 mph, while Marie will become a remnant low-pressure area within 48 hours.
Tropical Storm Karina became slightly better organized with deep convection near its center. The storm is forecast to move over cooler waters and into a drier atmosphere, leading to weakening trends and eventual dissipation. Maximum sustained winds were near 60 mph, with gusts expected to be higher.
Tropical Storm Rene weakened to a tropical depression on Sept. 8 but regained strength, with NASA's Aqua satellite capturing its seesaw-like pattern of strengthening and weakening storms. The strongest storms had cloud top temperatures as cold as minus 80 degrees Fahrenheit, indicating potential for heavy rainfall.
Tropical Storm Maysak formed on August 28 with a quick burst of strength, featuring powerful thunderstorms reaching temperatures as low as minus 80 degrees Fahrenheit. The storm's cloud tops cooled significantly over the past 6 hours, consolidating its circulation center.
Tropical Storm Hernan forms in the Eastern Pacific, moving towards Mexico's coast. NASA's nighttime view reveals a sheared tropical cyclone with potential for heavy rainfall due to cold cloud tops.
Post-tropical cyclone Marco has weakened toward dissipation after passing over the Gulf of Mexico, with NASA's Terra satellite capturing its final stages. The storm made landfall near the mouth of the Mississippi River and was pushed northeast by southwesterly wind shear.
Tropical Storm Genevieve has weakened rapidly due to various factors, including moderate southerly vertical wind shear and cooler sea-surface temperatures. As of Aug. 21, the storm is expected to degenerate into a post-tropical cyclone, moving further away from the Baja California peninsula.
The revised estimate of the inner core age is 1-1.3 billion years old, solving a paradox that arose from younger estimates. The researchers also found that the geodynamo was maintained by two different energy sources and mechanisms, providing new insights into the Earth's habitability.
Tropical Storm Higos is headed for a landfall in southeastern China, with NASA's Suomi NPP satellite capturing an image of the storm. The VIIRS instrument revealed deep convection and thunderstorms, forecast to intensify before making landfall.
NASA's Terra satellite reveals Post-Tropical Storm Fausto has lost strong storms, temperatures as cold as minus 50 degrees Fahrenheit. The National Hurricane Center confirms the system has become a remnant low-pressure area with no organized deep convection expected to return.
Elida has been downgraded to a post-tropical cyclone due to the absence of strong thunderstorms. The National Hurricane Center notes that without warm sea surface temperatures, organized deep convection will not return, making this the final advisory on Elida.
Researchers designed a silver plating to shield microwave waves and create uniform heating in liquids. This resolves the issue of water heated in a microwave not being the same as stovetop-heated liquid, promoting more consistent temperatures.
Hurricane Douglas rapidly intensified into a category 3 hurricane with maximum sustained winds near 120 mph, surrounded by powerful bands of thunderstorms. The storm's eye showed development of an eye and powerful thunderstorms circling it.
Tropical Depression 7E is weakening due to wind shear and cool ocean waters. The storm has lost all deep convection, with only a small patch of clouds remaining.
Researchers found that a phenomenon known as the Marangoni effect helps mezcal bubbles linger longer when alcohol content is around 50%, allowing artisans to determine perfect distillation levels. The study also reveals new fundamental details about bubble lifetimes on liquid surfaces.
Scientists studied sunspots and their movement, discovering a giant cell in each hemisphere with plasma moving towards the equator at 15 km/h. The meridional flow explains why sunspots emerge closer to the equator as solar cycles progress.
Subtropical Depression 4 formed over the North Atlantic Ocean on June 22, with cold cloud top temperatures indicating strong storms. The depression is expected to weaken and transition into a post-tropical cyclone by Wednesday.
Researchers used model simulations to study Saturn's polar hexagon, discovering a potential mechanism for its formation. The simulations produced latitudinal flow jets and vortices that resembled those observed on Saturn, suggesting a possible explanation for the stable pattern.
Researchers improve forecasting of strong convective weather using analogy method, which estimates occurrence environment for similar weather phenomena based on historical model forecasts. The method performs well in predicting potential for strong convection in different regions of China.
Typhoon Vongfong made landfall in the Philippines on May 14, 2020, as a typhoon. The storm weakened into a tropical storm by May 15, with maximum sustained winds of 60 knots (69 mph/111 kph).
A new theoretical model breaks down vertical atmospheric movement into dry and moist components, explaining regional patterns of extreme precipitation sensitivity. The model suggests that climate warming impacts vary by latitude, with the dry component dominating in mid-latitudes.
Researchers analyzed data from 224 stars to understand the interplay between rotation and convection in determining a star's activity level. The study found that turbulent convection plays a crucial role in explaining the behavior of main-sequence and evolved stars, contradicting previous models.
Researchers at the University of Washington and Lowell Observatory found that Betelgeuse's surface temperature remains relatively stable despite recent dimming. The team calculated the average surface temperature of the star using a filter to 'dampen' its light, revealing a surface temperature of around 3,325 degrees Celsius.
Typhoon Phanfone made landfall in central Philippines with NASA-NOAA's Suomi NPP satellite, revealing an intermittent eye feature. The storm has intensified to 65 knots and is forecast to strengthen further over the Sulu Sea and South China Sea.
This study demonstrates a novel self-sustaining liquid-cooling system that partially recovers lost thermal energy through electric power generation. The integration of thermo-electrochemical conversion with forced convection cooling enables the use of wasted heat for pumping coolant, reducing the need for active cooling.
Subtropical Storm Melissa forms off the New England coast, bringing strong winds and coastal flooding to the mid-Atlantic region. The National Hurricane Center predicts gradual weakening over the next few days, with Melissa expected to lose its subtropical characteristics by Saturday night.
NASA's Terra satellite captured an image of Tropical Storm Karen showing strongest thunderstorms west of center, indicating weakening. The storm is forecast to become a remnant low by Sunday with wind speeds near 45 mph and minimum central pressure at 1004 millibars.
Tropical Storm Kiko maintained its strength and shape after weakening from hurricane-force, with strong bands of thunderstorms visible in satellite imagery. The storm is forecast to slowly strengthen and potentially regain hurricane strength on Friday.
Tropical Storm Kiko strengthened into a tropical storm on Sept. 11, with NASA-NOAA's Suomi NPP satellite capturing its nighttime image on Sept. 12. The storm is forecast to approach hurricane strength later this weekend and is expected to continue moving west-northwest.
Hurricane Juliette has been weakening due to NASA-NOAA's Suomi NPP satellite observations, with the strongest storms located in its western quadrant. The storm is expected to become a tropical storm by Friday night and degenerate into a remnant low-pressure area on Sunday.
Tropical Depression Dalila is weakening due to cooler sea surface temperatures and dry air. The system is expected to dissipate within a few days, with Dalila becoming a post-tropical remnant low tonight.
Typhoon Wutip has lost its eye and elongated due to wind shear, with maximum sustained winds decreasing to 90 mph. The storm is forecast to continue weakening over the next few days, becoming a depression in a day or two.
NASA's Terra satellite captured visible imagery of Tropical Storm Gelena in the Southern Indian Ocean on Feb 13. The storm was centered near 26 degrees north latitude and 79 degrees east longitude, with maximum sustained winds near 55 knots.
A new study by University of Texas at Austin researchers reveals that the primary driver of solutal convection in porous media is not density, but mechanical dispersion. The findings contradict decades of scientific consensus and have significant implications for CO2 sequestration and other applications.