Bubble Enhanced Heating
Bubble Enhanced Heating - Related Videos
08:28
Synthesis of Phase-shift Nanoemulsions with Narrow Size Distributions for Acoustic Droplet Vaporization and Bubble-enhanced Ultrasound-mediated Ablation
0 Views •
Cited by 18 •
2012
Phase-shift nanoemulsions (PSNE) can be vaporized using high intensity focused ultrasound to enhance localized heating and improve thermal ablation in tumors. In this report, the preparation of stable PSNE with a narrow size distribution is described. Furthermore, the impact of vaporized PSNE on ultrasound-mediated ablation is demonstrated in tissue-mimicking phantoms.
07:32
Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
0 Views •
Cited by 17 •
2017
Pool-boiling heat-transfer experiments were carried out to observe the effects of hybrid wettable patterns on the heat-transfer coefficient (HTC). The parameters of investigation are the number of interlines and the pattern orientation of the modified wettable surface.
01:13
Excess Pressure Inside a Drop and a Bubble
0 Views •
2023
The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops. where γ corresponds to the surface tension. Recalling that the force per...
11:38
Heat Exchanger Analysis
0 Views •
2023
Source: Alexander S Rattner and Christopher J Greer; Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA Heat exchangers transfer thermal energy between two fluid streams, and are ubiquitous in energy systems. Common applications include car radiators (heat transfer from hot engine coolant to surrounding air), refrigerator evaporators (air inside refrigerator compartment to evaporating refrigerant), and cooling towers in power plants...
02:46
Quantifying Heat
0 Views •
2025
Thermal Energy Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative measure of “hot” or “cold”, which depends on the amount of thermal energy. When the atoms and molecules in an object are moving or vibrating quickly, they have a higher average kinetic energy (KE) (or higher thermal energy), and the object is perceived as “hot”, or it is described as being at a higher temperature. When the atoms and...
FAQs
The key sequence is nucleation, growth, detachment, and liquid replacement. Nucleation begins at sites on the heated surface once the liquid reaches its boiling condition. As bubbles grow and leave, they induce local mixing, while evaporation near the surface and incoming cooler liquid renew the nearby liquid. Together, these effects increase the heat transfer coefficient and support rapid heating.
Bubble size and growth rate influence how strongly the nearby liquid is disturbed and how quickly cooler liquid replaces heated liquid. Surface properties affect the availability and behavior of nucleation sites, while fluid conditions influence bubble development. Engineers examine these factors together because their interaction determines heating performance, surface temperature behavior, and the likelihood of unstable boiling.
Unstable boiling can make heat-transfer behavior difficult to control and may increase the risk of surface damage. The desired process depends on bubbles forming, growing, and detaching in a useful pattern while cooler liquid returns to the heated region. For this reason, engineers must consider bubble behavior and operating conditions when seeking high heating rates without excessive surface-temperature rise.
A basic evaluation begins by bringing the heated surface to the liquid’s boiling condition and observing bubble formation, growth, and detachment. Engineers then assess bubble size, growth rate, surface properties, and fluid conditions in relation to the heat transfer coefficient and surface temperature. This evaluation helps identify conditions that improve heating while reducing the possibility of unstable boiling or surface damage.
The approach is relevant wherever engineers need strong heat transfer between a heated surface and a liquid. Supported applications include boiling heat exchangers, thermal management systems, chemical processing, and energy technologies. In each setting, the useful outcome is high heating performance with limited surface-temperature rise, provided that bubble behavior and fluid conditions remain suitable for the design.
It can reveal how bubble size, growth rate, surface properties, and fluid conditions affect the heat transfer coefficient and surface-temperature response. These observations help engineers judge whether a design can deliver high heating rates while avoiding unstable boiling or surface damage. The resulting understanding supports optimization of equipment and processes that depend on liquid-side heating.