What are pulsating heat pipes?

Pulsating heat pipes (PHPs) are compact cooling equipment used for various applications. This type of heat pipes can be used in renewable energy systems, cooling electronic devices, heat recovery systems and many other applications.

What is a oscillation heat pipe?

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.

What are the advantages of heat pipe?

Heat pipe technology is an efficient yet effective approach to enclosure cooling that contains no moving parts except for air circulation fans. This characteristic makes it highly suitable for applications that require a sealed enclosure but have limited power supplies.

Which are the main applications of heat pipes?

Heat pipes were first developed for use by Los Alamos National Laboratory to supply heat to and remove waste heat from energy conversion systems. Today, heat pipes are used in a variety of cooling applications from space to medical devices and power electronics cooling to aircraft and more!

How does a CPU heat pipe work?

A heat pipe is a two-phase heat transfer device with a very high effective thermal conductivity. In the condenser, the vapor condenses and gives up its latent heat. The condensed liquid returns to the evaporator through the wick structure by capillary action.

Do Heat pipes work upside down?

The fact that the heat pipe works at all in the “upside-down” orientation ( < 0) is due, of course, to the wicking of the condensed fluid against gravity.

How efficient are heat pipes?

Due to the very high heat transfer coefficients for boiling and condensation, heat pipes are highly effective thermal conductors. The effective thermal conductivity varies with heat pipe length, and can approach 100 kW/(m⋅K) for long heat pipes, in comparison with approximately 0.4 kW/(m⋅K) for copper.

Which limit can lead to choking of flow in a heat pipe?

The sonic limit is typically experienced in liquid metal heat pipes during startup or low-temperature operation due to the associated very low vapor densities in this condition. This may result in choked, or sonic, vapor flow.

How long do vapor chambers last?

Vapor Chambers are generally used for high heat flux applications, or when genuine two-dimensional spreading is required. The lower cost HiK™ plates are used when only high conductivity in a tailored direction is required….Parameter.

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 is heat pipe technology?

Heat pipe. A heat pipe is a heat-transfer device that combines the principles of both thermal conductivity and phase transition to effectively transfer heat between two solid interfaces. At the hot interface of a heat pipe a liquid in contact with a thermally conductive solid surface turns into a vapor by absorbing heat from that surface.

What are heat pipes?

A typical heat pipe consists of a sealed pipe or tube made of a material that is compatible with the working fluid such as copper for water heat pipes, or aluminum for ammonia heat pipes. Typically, a vacuum pump is used to remove the air from the empty heat pipe.

What is double pipe heat exchanger?

A double pipe heat exchanger (also sometimes referred to as a ‘pipe-in-pipe’ exchanger) is a type of heat exchanger comprising a ‘tube in tube’ structure. As the name suggests, it consists of two pipes, one within the other. One fluid flows through the inner pipe…