Study of Exhaust Manifold

Conjugate Heat Transfer Analysis

The term conjugate heat transfer is used to describe processes which involve variations of temperature within solids and fluids, due to thermal interaction between the solids and fluids. A typical example is the heating or cooling of a solid object by the flow of air in which it is immersed.

The conjugate heat transfer methodology allows a simultaneous solution of aerodynamics and heat transfer in the external hot gas and the internal cooling passages and conduction within the solid metal, eliminating the need for multiple/decoupled solutions in a typical industry design process

• Conjugate heat transfer refers to the ability to compute conduction of heat through solid, coupled with convective heat transfer in the fluid.
• Coupled boundary conditions are available for all zones that separate two cell zones.
• Either the solid zone or the fluid zone, or both, may contain heat sources.

Example

1. Heat Exchanger
2. Internal Combustion Engine
3. Heat Sink
4. Boiler
5. Reactor
6. Heat Pipe
7. Turbocharger etc.

Conjugate heat transfer investigation is valuable in precisely foreseeing the surface temperatures and heat exchanging abilities of the designing gadgets. Through the investigation, engineers can optimize the thermal characteristics for their chosen product design.

• Measurement of heat transfer through physical phenomenon in solid regions.
• Identification of fluid flow parameters around the solid domain.
• Measurement of convective heat transfer from solids to the encompassing fluid surroundings.
• Evaluation of heat transfer capabilities of the product.
• Measurement of surface temperatures and hot spot regions.
• Design improvement for improvement in heat transfer rate and cooling capability.

Exhaust Manifold

In an internal combustion engine, the exhaust manifold collects the products of combustion (exhaust gases) from two or more cylinders and conducts these to a single exhaust pipe.

Typically made of stainless steel, cast-iron or heavy-gauge steel, the exhaust manifold directs exhaust gases from multiple cylinders to a single exhaust pipe. In so doing, the exhaust manifold also helps to minimize leakage of heat, air, and gases. Copper gaskets connecting the manifold to the cylinder heads can be used to create a more airtight system, though these are not necessary.

By minimizing the loss of heat, the exhaust manifold reduces the temperature under the hood. This helps to prevent overheating and damage to heat-sensitive parts while increasing power by reducing the temperature of the intake manifold. As gases move more quickly in higher temperatures, the exhaust manifold helps to increase the speed at which exhaust leaves the system.

Analysis of Exhaust port at baseline Mesh

Analysis of Finer Mesh

Grid Independency Test