Radiator considering Internal Flow CFD Simulation

Description

Radiator considering Internal Flow, Ansys Fluent CFD Simulation Training

In this case, we simulated an internal flow radiator is simulated by Ansys Fluent software. In this modeling, the hot oil is cooled with cold water so that a spiral tube in which the oil flows into a rectangular cubic chamber that Water is flowing inside it. The oil inlet velocity is 0.05 m / s with a temperature of 400 K. The water inlet velocity is 0.01 m / s with a temperature of 273 K. Both fluids are discharged to an environment at atmospheric pressure.

Geometry & Mesh

The geometry of this modeling is three-dimensional and is designed with Spaceclaim software, which consists of two parts: a spiral tube and a rectangular cubic chamber.

The meshing of this modeling has been done with Ansys Meshing software, and the total number of cells is 1615429, which can be seen in the picture below.

CFD Simulation

We consider several assumptions to simulate the present model:

• We perform a pressure-based solver.
• The simulation is steady.
• The gravity effect on the fluid is ignored.

The following table represents a summary of the defining steps of the problem and its solution:

Models (Radiator)
Viscous		k-epsilon
	k-epsilon model	realizable
	near-wall treatment	Menter-lechner
Energy		On
Boundary conditions (Radiator)
Inlet water		Velocity Inlet
	velocity magnitude	0.01 m.s-1
	temperature	273 K
Inlet oil		Velocity Inlet
	velocity magnitude	0.05 m.s-1
	temperature	400 K
Outlet water		Pressure Outlet
	gauge pressure	0  pascal
Outlet oil		Pressure Outlet
	gauge pressure	0 pascal
Inner Wall		Wall
	wall motion	stationary wall
	thermal condition	coupled
Outer Wall		Wall
	wall motion	stationary wall
	thermal condition	convection
	heat transfer coefficient	10 W.m-2.K-1
	free stream temperature	290 K
Methods (Radiator)
Pressure-Velocity Coupling		SIMPLE
	pressure	second-order
	momentum	second-order upwind
	turbulent kinetic energy	first-order upwind
	turbulent dissipation rate	first-order upwind
	energy	second-order upwind
Initialization (Radiator)
Initialization methods		hybrid

Radiator considering Internal Flow Results

After simulating that temperature, speed, and pressure contours can be drawn, it is clear that this radiator has been able to do its job well and has decreased the oil temperature from 400 K to 363 K. The temperature of the water itself has increased by 20 during this process. The inlet speed of water and oil greatly affects heat transfer, and naturally, the outlet temperatures of water and oil can be changed.