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Related Concept Videos

Surface Active Agents01:27

Surface Active Agents

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Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
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Surface Tension of Fluid01:22

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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
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Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

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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.
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Buoyancy and Stability for Submerged and Floating Bodies01:11

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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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Buoyancy01:12

Buoyancy

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When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy.  The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the...
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Breathing01:05

Breathing

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The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
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Updated: Mar 27, 2026

Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
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Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device

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Surfactants for Bubble Removal against Buoyancy.

Md Qaisar Raza1, Nirbhay Kumar1, Rishi Raj1

  • 1Thermal and Fluid Transport Laboratory, Department of Mechanical Engineering, Indian Institute of Technology, Patna, Bihar 801103, India.

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Surfactants in soap prevent vapor bubble coalescence on heated surfaces, enabling downward bubble removal. This technique significantly enhances heat transfer, crucial for space applications.

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Area of Science:

  • Heat Transfer
  • Fluid Dynamics
  • Materials Science

Background:

  • Buoyancy-induced vapor bubble lift-off is critical for heat transfer.
  • In microgravity, bubble coalescence degrades heat transfer.
  • Inverted heaters face challenges with buoyancy and surface tension opposing bubble removal.

Purpose of the Study:

  • To develop a passive technique for enhanced bubble removal from inverted heaters.
  • To investigate the use of surfactants for controlling bubble behavior.
  • To improve heat transfer in boiling systems, especially for space applications.

Main Methods:

  • Utilized surfactants from common soaps and detergents.
  • Developed a force balance model to analyze forces acting on bubbles.
  • Measured bubble removal frequencies and heat transfer enhancement.

Main Results:

  • Surfactants prevented bubble coalescence and promoted downward bubble removal.
  • Repulsive forces from adsorbed surfactants overcame buoyancy and surface tension.
  • Bubble removal frequencies exceeding 10 Hz were achieved.
  • Over twofold enhancement in heat transfer compared to pure water.

Conclusions:

  • A novel passive technique using surfactants effectively manages vapor bubble dynamics.
  • This method enhances heat transfer by preventing dry patch formation.
  • The findings offer potential for improved boiling-based systems in microgravity environments.