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Heat Exchanger Simulation

Heat Exchanger Simulation is at the core of what we do at our Singapore office in BroadTech Engineering.Heat Exchanger Simulation

Featured Heat Exchanger Simulation Case Studies

Flow and Heat Transfer Characteristics of a Non-Newtonian Fluid through a Channel

Simulation Objective:
To compare the flow and heat transfer characteristics of a non-Newtonian fluid between two flat parallel plates with that of a Newtonian fluid and further use these results for a Plate heat exchanger.
Methodology:
The geometry is prepared in ICEM and grid with 25000 cells is generated and imported into Fluent. The velocity inlet and pressure outlet, as well as the constant wall temperature boundary conditions, were given, and the flow simulated using a pressure-based solver in Ansys Fluent. The pressure-velocity coupling was done using the SIMPLE algorithm and the solvers used were Standard for pressure and First Order Upwind for momentum and energy. The convergence criteria were 10-7 for velocity and 10-6 for energy.
Conclusion:
Fully developed flow is achieved earlier in the non-Newtonian fluid as compared to Newtonian fluid.
The transition length is lower for lesser inlet flow velocity and gap thickness.
Temperature profiles reveal more uniform temperature distribution for lesser inlet flow velocity and gap thickness.
The nusselt number has higher maximum value for minimum gap thickness whereas higher value at an outlet for maximum inlet velocity and vice-versa for Prandtl number.
Thus, the heat transfer coefficient is largely affected by the Non-Newtonian behavior of the fluid.

Flow behavior of an elastic and a Neo-Hookean particle in a Newtonian fluid using ABAQUS

Simulation Objective: To study the flow behavior of an elastic and a Neo-Hookean particle in a Newtonian fluid and study the effect of these deformable particles on the overall stresses and viscosity of the fluid.
Methodology: Geometry of the domain is prepared in Abaqus-CFD and the particle in Abaqus-Standard. A fluid structure co-simulation boundary is created between the fluid and particle such that the velocity and traction continuity is ensured. The domain meshes and the system co-simulated the Abaqus-CFD and Abaqus-Standard models. The former is solved using Finite Volume Method and the later using Finite Element Method. The effect of variable shear rates and variable L/D ratios (L = length of the channel, D = diameter of the particle) are studied for initially spherical and initially ellipsoidal particles respectively.
In Abaqus-CFD, the CFL no is 0.45 and the preconditioner type is Algebraic multigrid and the solver type is a conjugate gradient. The convergence criteria are 10-5 for both velocity and pressure.
In Abaqus-Standard, the linear bulk viscosity parameter was 0.06 and quadratic bulk viscosity parameter was 0.12. Four-node linear tetrahedral elements are used with dynamic explicit time steps. The time scaling factor is 0.5
Conclusion: 
The spherical particle deforms and attains a steady ellipsoidal shape with a fixed orientation angle.
The deformation increases with the increased shear rate; however, a minimum shear rate is required to deform the particle.
The larger the L/D ratio, the smaller is the deformation. In other words, the deformation is affected largely in the vicinity of the walls.
The overall viscosity of the fluid and the velocity profile around the particle changes. The particles tend to migrate laterally towards the region of lowest shear rate.

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