Abstract
An innovative hydraulic design was studied for corrugated tube geometry for a heat exchanger. An ellipse based double corrugation was used as a concept of the geometry. The hydraulic diameter (Dh) is maintained over the tube
length while the shape of the cross section varies continuously along the flow direction. 38 corrugated tubes with a Dh of 5 mm were studied numerically with corrugation heights from 0.23 to 0.69 mm and corrugation periods from 5 to 50 mm
for laminar flow with water. Computational fluid dynamics (CFD) is used as a tool to study the effect of corrugation geometry on heat transfer and fluid flow with a constant wall temperature and total pressure drop. The governing equations
for these problems were solved using the Finite Element Method. The results of numerical modelling show significant increase in NTU for double corrugated tubes compared to a circular tube. The friction factor increases with increasing of
severity index, which represents the degree of tube roughness.
length while the shape of the cross section varies continuously along the flow direction. 38 corrugated tubes with a Dh of 5 mm were studied numerically with corrugation heights from 0.23 to 0.69 mm and corrugation periods from 5 to 50 mm
for laminar flow with water. Computational fluid dynamics (CFD) is used as a tool to study the effect of corrugation geometry on heat transfer and fluid flow with a constant wall temperature and total pressure drop. The governing equations
for these problems were solved using the Finite Element Method. The results of numerical modelling show significant increase in NTU for double corrugated tubes compared to a circular tube. The friction factor increases with increasing of
severity index, which represents the degree of tube roughness.
| Original language | English |
|---|---|
| Publication date | 2017 |
| Number of pages | 10 |
| Publication status | Published - 2017 |
| Event | 9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics (ExHFT-9 2017) - Iguazu Falls, Brazil Duration: 11 Jun 2017 → 15 Jun 2017 Conference number: 9 http://exhft9.org/ |
Conference
| Conference | 9th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics (ExHFT-9 2017) |
|---|---|
| Number | 9 |
| Country/Territory | Brazil |
| City | Iguazu Falls |
| Period | 11/06/2017 → 15/06/2017 |
| Internet address |
Keywords
- Heat transfer enhancement
- Pressure drop
- Numerical simulation
- 3D corrugated tube