Login | Signup now       

Guest

 Click to see how  

HOME | VIDEOS | DOCUMENTS | COLLECTIONS | UPLOAD | BROADCAST | MY ACCOUNT | FEEDBACK | ABOUT

 
Videos search results: "heat"
 
 Videos
 
   Featured
   Most Viewed
   Most Recent
   Most Discussed
 
 All Subjects
 
  Aeronautics and A...   
  Anthropology   
  Architecture   
  Arts   
  Astronomy   
  Bioengineering   
  Biology   
  Business and Mana...   
  Chemistry and Che...   
  Civil and Environ...   
  Cognitive Science   
  Communications   
  Computer Science   
  Earth and Atmosph...   
  Economics   
  Education   
  Electrical Engine...   
  Energy   
  Entrepreneurship ...   
  History   
  Humanities   
  Journalism   
  Laboratory Equipm...   
  Languages and Lit...   
  Linguistics   
  Material Science ...   
  Mathematics   
  Mechanical Engine...   
  Media Arts   
  Medical Sciences   
  Music   
  Nanoscience and N...   
  Neuroscience   
  Nuclear Engineeri...   
  Oceanography and ...   
  Philosophy   
  Physics   
  Political Science   
  Psychology   
  Public Health   
  Robotics and Arti...   
  Softwares and Pro...   
  Uncategorized   
 

 

 

 

 

 

 

Title          
Jumping droplets help heat transfer 
   
 
Abstract    
Excerpt from MIT's Research Update - Many industrial plants depend on water vapor condensing on metal plates: In power plants, the resulting water is then returned to a boiler to be vaporized again; in desalination plants, it yields a supply of clean water. The efficiency of such plants depends crucially on how easily droplets of water can form on these metal plates, or condensers, and how easily they fall away, leaving room for more droplets to form. The key to improving the efficiency of such plants is to increase the condensers’ heat-transfer coefficient — a measure of how readily heat can be transferred away from those surfaces, explains Nenad Miljkovic, a doctoral student in mechanical engineering at MIT. As part of his thesis research, he and colleagues have done just that: designing, making and testing a coated surface with nanostructured patterns that greatly increase the heat-transfer coefficient.

The results of that work have been published in the journal Nano Letters, in a paper co-authored by Mil...

 
Go to video page
 
Added By - A Ghosh
Subject - Mechanical Engineering
Document Type - Patents and Inventions
Video Duration - moderate
 
 
 

 

Title          
Rijke Tube 
   
 
Abstract    
Rijke's tube turns heat into sound, by creating a self-amplifying standing wave. It is an entertaining phenomenon in acoustics and is an excellent example of resonance. P. L. Rijke was a professor of physics at the Leiden University in the Netherlands when, in 1859, he discovered a way of using heat to sustain a sound in a cylindrical tube open at both ends. He used a glass tube, about 0.8 m long and 3.5 cm in diameter. Inside it, about 20 cm from one end, he placed a disc of wire gauze as shown in the figure at right. Friction with the walls of the tube is sufficient to keep the gauze in position. With the tube vertical and the gauze in the lower half, he heated the gauze with a flame until it was glowing red hot. Upon removing the flame, he obtained a loud sound from the tube which lasted until the gauze cooled down (about 10 s). It is safer in modern reproductions of this experiment to use a Pyrex tube or, better still, one made of metal. Source : Wikipedia
 
Go to video page
 
Added By - A Ghosh
Subject - Physics
Document Type - Course Lecture
Video Duration - moderate
 
 
 

 

Title          
Lamina Flow Stirling Engine 
   
 
Abstract    

This amazingly simple engine runs at 700rpm heated only by a small candle.

Thermoacoustic hot air engines (Sonic heat pump and refrigeration or thermoacoustic heat pump and refrigeration) of which nearly all are thermoacoustic stirling engines is a technology that uses high-amplitude sound waves in a pressurized gas to pump heat from one place to another - or uses a heat temperature difference to induce sound, which can be converted to electricity with high efficiency, with a (piezoelectric) loudspeaker.

This type of heat pump or refrigerator has no

 
Go to video page
 
Added By - quantum
Subject - Energy
Document Type - Demonstration
Video Duration - 00:01:00
 
 
 

 

Title          
Influence of a Streamwise Pressure Gradient o... 
   
 
Abstract    

In this video, Kiran Dellimore gives a broad overview of his research paper entitled  'Influence of a Streamwise Pressure Gradient on Film-Cooling Effectiveness' published in the JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER,Vol. 23, No. 1, January-March 2009. His co-authors are Carlos Cruz, Andre W. Marshall, and Christopher P. Cadou all from the University of Maryland, College Park, Maryland 20742.

The paper may be accessed using the following DOI: 10.2514/1.35717

Film cooling is widely used in conventional gas turbine and rocket engines to minimize thermal loading of engine structures and to manage heat transfer between hot, reacting gases and cooler structural components. Previous experimental work has shown that streamwise pressure gradients strongly influence the performance of the film.This paper extends semi-empirical modeling ideas for wall-jet film cooling to include the effects of adverse and favorable pressure gradients. The extended model shows that a pressure gradient’s effect on cooling performance depends on whether the velocity of the film is greater than the core flow (a wall-jet...

 
Go to video page
 
Added By - kdellimo
Subject - Aeronautics and Astronautics
Document Type - Journal Paper Discussion
Video Duration - 00:05:20
 
 
 

 

Title          
Model of a stirling engine in motion 
   
 
Abstract    

Model of stirling engine realized by a syringe and a test-tube.

In the family of heat engines, 'Stirling engine' defines a closed-cycle regenerative hot air engine (or other permanent gas) engine, though the term is often used incorrectly to refer generically to a much wider range of hot air engine types. In this context, "closed-cycle" means that the working fluid is permanently contained within the system, whereas "open-cycle" engines such as internal combustion engine and some steam engines, exchange working fluid with their surroundings as part of the

 
Go to video page
 
Added By - quantum
Subject - Mechanical Engineering
Document Type - Demonstration
Video Duration - 00:00:58
 
 
 

 

Title          
Marble displacer Stirling Engine 
   
 
Abstract    

5 rolling marbles act as the displacer in this engine. The rigid connection between the piston and conrod is what tips the test tube, rolling the marbles.

Model of stirling engine realized by a syringe and a test-tube.

In the family of heat engines, 'Stirling engine' defines a closed-cycle regenerative hot air engine (or other permanent gas) engine, though the term is often used incorrectly to refer generically to a much wider range of hot air engine types. In this context, "closed-cycle" means that the working fluid is permanently contained within the system, whereas "open-cycle" engines such as internal combustion engine and some st...

 
Go to video page
 
Added By - quantum
Subject - Mechanical Engineering
Document Type - Demonstration
Video Duration - 00:00:08
 
 
 

 

Title          
Aerodynamic Heating and Deceleration During E... 
   
 
Abstract    
Dr. Chapman's lecture examines the physics behind spacecraft entry into planetary atmospheres. He explains how scientists determine if a planet has an atmosphere and how scientists can compute deceleration when the atmospheric conditions are unknown. Symbols and equations used for calculations for aerodynamic heating and deceleration are provided. He also explains heat transfer in bodies approaching an atmosphere, deceleration, and the use of ablation in protecting spacecraft from high temperatures during atmospheric entry.
 
Go to video page
 
Added By - A Ghosh
Subject - Aeronautics and Astronautics
Document Type - Documentary
Video Duration - 00:28:44
 
 
 

 

Title          
Speed of Sound 
   
 
Abstract    

Sound is a vibration that travels through an elastic medium as a wave. The speed of sound describes how far this wave travels in a given amount of time. In dry air at 20 °C (68 °F), the speed of sound is 343 meters per second (1,125 ft/s). This equates to 1,236 kilometers per hour (768 mph), or about one mile in five seconds. This figure for air (or any given gas) increases with gas temperature (equations are given below), but is nearly independent of pressure or density for a given gas. For different gases, the speed of sound is dependent on the mean molecular weight of the gas, and to a lesser extent upon the wa...

 
Go to video page
 
Added By - reberg
Subject - Physics
Document Type - Demonstration
Video Duration - 00:04:04
 
 
 

 

Title          
Twin cylinder thermo-acoustic Stirling Engine... 
   
 
Abstract    
A precision-built twin cylinder twin piston thermo-acoustic Stirling engine. These engines are sometimes called Lag engines and sometimes called Lamina flow engines.
 
Go to video page
 
Added By - quantum
Subject - Aeronautics and Astronautics
Document Type -
Video Duration - 00:01:14
 
 
 

 

Title          
Stirling engine example 
   
 
Abstract    

This is intended as an example of how much power can be produced out of nothing but heat and air density, and how your car's engine has to overcome this.

Stirling's air engine (as it is referred to in early text books - see hot air engine history) was invented by Reverend Dr Robert Stirling and patented by him in 1816. When the name became simplified to Stirling engine is not known, but may be as recently as the mid twentieth century when the Philips company began to experiment with working fluids other than air - the instruction book for their MP1002CA (see below) still refers to it as an 'air engine'. The main subject of that original patent was a heat exchanger which Stirling called the "economiser" for its enhancement of fuel economy in a variety of applications. The patent also described in detail the employment of one form of the economiser in an air engine, in which application ...

 
Go to video page
 
Added By - quantum
Subject - Energy
Document Type - Demonstration
Video Duration - 00:02:05
 
 
 

Page 1 of 2
     Next >>