# A new low-Reynolds version of an explicit algebraic stress model for turbulent convective heat transfer in ducts

## Abstract

The performance of a turbulence model in predicting the flow and temperature fields of relevant industrial problems has become increasingly important during the last few years. This is also valid for turbulent duct flow, which occurs frequently in many industrial applications such as compact heat exchangers, gas turbine cooling systems, recuperaters, cooling channels in combustion chambers, intercoolers, nuclear reactors, etc. This investigation concerns performance of a new low-Reynolds version of an explicit algebraic stress model (EASM) for numerical calculation of turbulent forced-convective heat transfer and fluid flow in straight ducts with fully developed conditions. The turbulent heat fluxes are modeled by a SED concept, the GGDH, and the WET methods. New versions of GGDH, WET, and EASM are presented for low Reynolds numbers. However, at high Reynolds numbers, two wall functions are used, one for velocity fields and one for the temperature field. All the models are computed in a general three-dimensional channel. The low-Reynolds version of the models presented is very stable and has been used for Reynolds numbers up to 70,000 with least demanded number of grid points, and without any convergence problem or stability problem.

- Authors:

- Publication Date:

- Research Org.:
- Lund Inst. of Tech. (SE)

- OSTI Identifier:
- 20067736

- Resource Type:
- Journal Article

- Journal Name:
- Numerical Heat Transfer. Part B, Fundamentals

- Additional Journal Information:
- Journal Volume: 37; Journal Issue: 3; Other Information: PBD: Apr-May 2000; Journal ID: ISSN 1040-7790

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 42 ENGINEERING; FORCED CONVECTION; TURBULENT FLOW; DUCTS; THREE-DIMENSIONAL CALCULATIONS; FLOW MODELS

### Citation Formats

```
Rokni, M.
```*A new low-Reynolds version of an explicit algebraic stress model for turbulent convective heat transfer in ducts*. United States: N. p., 2000.
Web. doi:10.1080/104077900275431.

```
Rokni, M.
```*A new low-Reynolds version of an explicit algebraic stress model for turbulent convective heat transfer in ducts*. United States. doi:10.1080/104077900275431.

```
Rokni, M. Mon .
"A new low-Reynolds version of an explicit algebraic stress model for turbulent convective heat transfer in ducts". United States. doi:10.1080/104077900275431.
```

```
@article{osti_20067736,
```

title = {A new low-Reynolds version of an explicit algebraic stress model for turbulent convective heat transfer in ducts},

author = {Rokni, M.},

abstractNote = {The performance of a turbulence model in predicting the flow and temperature fields of relevant industrial problems has become increasingly important during the last few years. This is also valid for turbulent duct flow, which occurs frequently in many industrial applications such as compact heat exchangers, gas turbine cooling systems, recuperaters, cooling channels in combustion chambers, intercoolers, nuclear reactors, etc. This investigation concerns performance of a new low-Reynolds version of an explicit algebraic stress model (EASM) for numerical calculation of turbulent forced-convective heat transfer and fluid flow in straight ducts with fully developed conditions. The turbulent heat fluxes are modeled by a SED concept, the GGDH, and the WET methods. New versions of GGDH, WET, and EASM are presented for low Reynolds numbers. However, at high Reynolds numbers, two wall functions are used, one for velocity fields and one for the temperature field. All the models are computed in a general three-dimensional channel. The low-Reynolds version of the models presented is very stable and has been used for Reynolds numbers up to 70,000 with least demanded number of grid points, and without any convergence problem or stability problem.},

doi = {10.1080/104077900275431},

journal = {Numerical Heat Transfer. Part B, Fundamentals},

issn = {1040-7790},

number = 3,

volume = 37,

place = {United States},

year = {2000},

month = {5}

}