Table of Contents
What is a pin fin heat sink?
A pin fin heat sink is a heat sink that has pins that extend from its base. The pins can be cylindrical, elliptical or square. A pin is by far one of the more common heat sink types available on the market. A second type of heat sink fin arrangement is the straight fin. These run the entire length of the heat sink.
What are pin fins used for?
Pin fins are used to increase heat transfer from heated surfaces to air. Industrial experience has shown that for the same surface area, pin fins can transfer considerably more energy than straight fins.
What is fins in heat sink?
Fin efficiency is one of the parameters that makes a higher-thermal-conductivity material important. A fin of a heat sink may be considered to be a flat plate with heat flowing in one end and being dissipated into the surrounding fluid as it travels to the other.
How are pin heat sinks made?
Depending on their shapes and materials, heat sinks can be made by many manufacturing methods. The most common and cost effective methods include extrusion, forging, casting and stamping. Cold forging is a highly precise process that can produce round pin and elliptical pin heat sinks. …
Under what conditions are fins most effective?
The use of fins is most effective in applications involving low convection heat transfer coefficient. Thus, the use of fins is more easily justified when the medium is a gas instead of a liquid and the heat transfer is by natural convection instead of by forced convection.
What are the different types of heat sink?
Heat Sink Types
- Passive Heat Sink. Passive heat sinks are those that don’t rely on forced air flow (fans) and are considered more reliable than active solutions. …
- Active Heat Sink. …
- Aluminum Heat Sink. …
- Copper Heat Sink. …
- Solid Metal Heat Sink. …
- Pumped Liquid Heat Sink. …
- Two-Phase Heat Sink. …
- CNC Machined Heat Sink.
How does a pin fin work?
Pin-fin heat sinks are efficient in impingement cooling where a fan placed on top of the heat sink blows air directly on the surface. The pin-fin structure for impingement cooling lowers the thermal resistance. Impingement cooling also distributes the air evenly along the heat sink.
What is pin fin experiment?
Pin Fin Apparatus: This setup is designed to study the heat transfer in a pin fin. It consists of cylindrical fin fitted to the base in rectangular duct. A blower is provided on one side of duct to conduct experiments under forced convection heat transfer mode. … Heat input to the heater is given through variac.
What are the types of fins in heat transfer?
1) Constant Area Straight Fin2) Variable Area Straight Fin3) Pin Fin4) Annular Fin
- Constant Area Straight Fin.
- Variable Area Straight Fin.
- Pin Fin.
- Annular Fin.
What is the advantage of fins?
Fins improve kick technique by promoting the up kick which uses hamstring, glutes and lower back muscles. They add resistance to the range of motion, therefore building strength and power as the muscles are working harder. They can be used when swimming freestyle, butterfly and backstroke.
What is the use of fins in heat exchanger?
Fins are thus used whenever the available surface area is found insufficient to transfer required quantity of heat with available temperature gradient and heat transfer coefficient. In the case of fins the direction of heat transfer by convection is perpendicular to the direction of conduction heat flow.
What is fin in heat transfer Slideshare?
Introduction Fins are generally used to enhance the heat transfer from a given surface Addition of fins can increase the heat transfer from the surface by several folds In many engineering situation, means are often sought to improve heat dissipation from a surface to its surrounding Whenever the available …
What is fin efficiency?
Fin efficiency is defined as the ratio of actual heat flow of the fin to that which would be obtained with a fin of constant temperature uniformly equal to the base surface temperature, that is, one with infinite thermal conductivity.
How do you measure a heat sink?
Volumetric Thermal Resistance (Rv) This equation and subsequent guidelines have been shown to closely estimate heat sink volume: V=(Q*Rv)/Delta T. The first step in using the chart below is to know the available airflow across the heat sink. As you know, the higher the airflow the smaller the heat sink.
What makes a good fin heat transfer?
Typically, the fin material has a high thermal conductivity. The fin is exposed to a flowing fluid, which cools or heats it, with the high thermal conductivity allowing increased heat being conducted from the wall through the fin.
What is an ideal fin?
An ideal fin is the one whose temperature is equal to temperature of the surface. This is possible only if the thermal conductivity of fin material is infinitely high. The effectiveness of an actual fin material is always lower than an ideal fin.
Which type of fin is more effective in heat transfer?
The rectangular fin with single-step change has been found to be the most efficient fin profile in terms of maximum heat loss and fin efficiency. The optimum fin dissipated 3.4% more heat and provided 2% higher efficiency than the CRF profile.
What are two types of heat sink?
A heat sink thus transfers the heat from the high temperature component such as a transistor to the low-temperature medium such as air, oil, water or any other suitable medium through conduction and then convection. There are two types of heat sinks, namely the passive heat sink and the active heat sink.
Which heat sink is best?
Aluminum Heat Sinks Aluminum is the most common material for heat sinks. In particular, extruded aluminum heat sinks fit the needs of most projects. The metal is lightweight and has relatively good thermal conductivity.
Which material is best for heat sink?
Aluminum alloys Heat sinks are designed to maximize the surface area in contact with the coolant fluid. Aluminum alloys are the most common heat sink material. This is because aluminum costs less than copper. However copper is used where higher levels of thermal conductivity are needed.
How effective are heatsinks?
Heatsinks enable a more efficient heat transfer from the heat source to the adjacent fluid by using the extended surface area.
How does the heat sink work?
Heatsinks work by absorbing heat from the CPU or GPU to which they are attached. … As the CPU or GPU warms up, heat will transfer to these fins where it’s released using a fan. A fan is attached over the heatsink to circulate air. The fan runs in reverse, meaning it draws the hot air away from the CPU or GPU.
What is sink temperature?
The sink temperature refers to the cooling medium inlet temperature. For the charge air cooler or the radiator, the sink temperature is the cooling air temperature in front of the cooler or the radiator.
Why are fins provided on heat transferring surfaces?
In the study of heat transfer, fins are surfaces that extend from an object to increase the rate of heat transfer to or from the environment by increasing convection. … Thus, adding a fin to an object, increases the surface area and can sometimes be an economical solution to heat transfer problems.
Is convection heat transferred?
Convection. Convective heat transfer is the transfer of heat between two bodies by currents of moving gas or fluid. In free convection, air or water moves away from the heated body as the warm air or water rises and is replaced by a cooler parcel of air or water.
What do you understand by unsteady heat transfer experiment?
During this period, the temperature varies with time and body is said to be in the unsteady or transient state. This phenomenon is known as Unsteady or transient heat conduction. If the temperature of a body does not vary with time, it is said to be in steady state.
What are heat transfer modes?
The three types of heat transfer Heat is transfered via solid material (conduction), liquids and gases (convection), and electromagnetical waves (radiation). Heat is usually transfered in a combination of these three types and seldomly occurs on its own.