How does heat pipe work?
Heat pipes employ phase change to transfer thermal energy from one point to another by the vaporization and condensation of a working fluid or coolant. When one end of the heat pipe is heated, the working fluid inside the pipe at that end vaporizes and increases the vapor pressure inside the cavity of the heat pipe.
What is a heat pipe reactor?
Heat pipe cooled reactor is a new type reactor which uses heat pipe elements to cool the core (Fig. The fission heat is transferred to heat pipes through the structural material, and then the heat pipes transport the heat out of the core to energy conversion system.
How does an oscillating heat pipe work?
Oscillating heat pipes (OHPs) use pressure-driven, two-phase fluid flow to rapidly transfer heat between heat sources and heat sinks. They can be built in materials, fluids, shapes, and sizes that are not possible with conventional capillary-driven heat pipes or vapor chambers.
Do heat pipes work in reverse?
Standard heat pipes will transfer heat equally in both directions. If the nominal condenser is hotter than the evaporator, then heat will flow in reverse, from the “condenser” to the “evaporator”. A diode heat pipe is used when it is necessary to prevent heat flow in the reverse direction.
What is inside heat pipe?
A heat pipe is a two-phase heat transfer device with a very high effective thermal conductivity. It is a vacuum-tight device consisting of an envelope, a working fluid, and a wick structure. As shown in the video below, the heat input vaporizes the liquid working fluid inside the wick in the evaporator section.
What fluid is inside a heat pipe?
Working Fluids The most common heat pipe working fluid is water for an operating temperature range from 1°C to 325°C. Low temperature heat pipes use fluids such as ammonia and nitrogen. High temperature heat pipes utilize cesium, potassium, NaK and sodium (873–1,473°K).
What is high temperature pipe?
High temperature heat pipes (also known as alkali metal heat pipes) are typically defined as heat pipes that operate between 400 and 1100°C. They are often used to provide precise temperature uniformity or provide high-temperature heat transfer.
What is a heat pipe system?
A heat pipe is a two-phase heat transfer device with a very high effective thermal conductivity. It is a vacuum-tight device consisting of an envelope, a working fluid, and a wick structure. The saturated vapor, carrying the latent heat of vaporization, flows towards the colder condenser section.
How does heat work in a heat pipe?
The graphic below illustrates heat pipe working principles. As heat is applied, some of the liquid turns to vapor and travels to an area of lower pressure toward the cooling fins.
When was the heat pipe principle first invented?
The Heat Pipe Principle Having first been invented near the turn of the 20th century, the heat pipe is not in itself a new invention. Early heat pipes were constructed out of hollow metal tubes that were sealed at both ends, vacuumed, and charged with a small quantity of evaporative fluid.
How does the working principle of an AC generator work?
Working of an AC Generator When the armature rotates between the poles of the magnet upon an axis perpendicular to the magnetic field, the flux linkage of the armature changes continuously. As a result, an electric current flows through the galvanometer and the slip rings and brushes. The galvanometer swings between positive and negative values.
Why does water turn to vapor in a heat pipe?
Because it’s in a vacuum, water turn to vapor at much lower temperatures. Heat Pipe Vapor Space – the amount of internal space not taken up by water and wick that can be used to transport vapor. Not really a ‘part’ but a consequence of other ‘part’ choices.