Material Flow

“Material Flow” or Advection

Thermal Desktop® is capable of modeling steady and unsteady heat transfer problems for both moving and stationary parts, including conduction, convection, contact, and thermal radiation.

When a batch process is to be simulated, or when discrete parts move (such as ingots through a furnace, or ground-tracking antennae on satellites), the part itself can be translated or rotated within a transient solution. But when the motion is continuous, such that a steady-state solution is possible, different modeling methods are available.

Examples of such continuous motion include a sheet of glass solidifying as it is lowered through a temperature-controlled zone, a gypsum board moving through a dryer, and a conveyor belt carrying baked goods through a continuous oven. In those circumstances, you can build a fixed model of the both stationary parts (heat lamps, ovens, driers, and so forth) and the moving parts (rollers, sheets, belts, etc.). Then you can superimpose an advection or “material flow” term on the rotating or translating parts.

For example, below is an open mesh conveyor belt with rollers moving under three heat lamps (using collimated rays for illustration purposes). Ray plots have been superimposed to show the lamp rays passing through the semi-transparent mesh belt, losing energy as they pass through each layer.

A key feature of the Thermal Desktop advection tools is that you can analyze moving parts using fast-to-solve steady states. In the above case the belt is moving at 0.1 ft/s. In this video, the belt is surging between zero and 1 ft/s, making the numerical motion of the belt more obvious.

Example applications for this capability include:

  • Belt conveyor furnaces, conveyor ovens
  • Steel and aluminum sheet metal manufacturing
  • Glass making (especially plate glass)
  • Paper making, fiber products, particle board and flakeboard drying and curing, drywall (wallboard) manufacturing
  • Optical fiber manufacturing (drawing fiber optic cable through a furnace)
  • Pebble bed reactors
  • Coke furnaces
  • Rotary furnaces
  • Carbon foam and metal foam heat exchangers, geothermal storage systems
  • Rotating disk heat exchangers and dehumidifiers
  • Moving belt heat exchangers, moving belt radiators

Hot Wire: Material Flow Example

A large rectangular copper “wire” passes through a continuous-flow tubular furnace used to harden a thermoset polymer coating. A pair of cooled rollers at the exit of the furnace help to both position the wire and smooth the coating.

Click here to download the hot wire sample model from our forum.

Bar through oven

Advection model results

Advection model results roller detail

Advection model coating temperatures

 

flow regimes

Introduction to Two-phase Flow

September 24, 2-3pm MDT

This webinar introduces basic concepts in two-phase flow modeling including quality, void fraction, flow regimes, slip flow, pressure drops and accelerations, and heat transfer.

No knowledge of CRTech software is required. However, references to the corresponding FloCAD features will be made to assist users of that product.

Click here to register

Introductory FloCAD Training

Class times: September 5, 10, and 12, 2019, 9:00 am to 12:00 pm MDT daily
Cost: no charge (attendees must have an active support contract)

CRTech will be hosting introductory training for FloCAD (Flow Modeling in Thermal Desktop). This is our standard FloCAD class previously hosted in a classroom environment and now restructured for an online teaching environment.

The class will introduce single-phase fluid modeling concepts and how to build fluid models within the FloCAD work environment. Topics covered include an introduction to fluid modeling components, geometric versus non-geometric modeling options, working with FloCAD Pipes, solution control, and an introduction to path and pipe libraries.

The class will be broken into three two- to three-hour sessions held over a 3 day period. The format will be online lecture and demonstration with opportunities to ask questions. Hands-on lab work will be provided to students to work on after each session. To gain the most from this class, students are encouraged to attend all three sessions.

Prerequisites: Attendees must have basic working knowledge of Thermal Desktop as many of its base features will not be covered in this class but their usage is required for FloCAD.

Eligibility Requirement: This class is a service to our customers. All attendees must have an active support contract. If you are unsure of your support status, please contact CRTech.

Click here to register