Abstract
Bubbly flows are used in industrial processes to facilitate efficient mass and heat transfer for gas-liquid contact operations accompanied by chemical transformations, which are often associated with substantial heat liberation due to exothermic reactions. In this paper we study the heat transfer enhancement from a hot wall to bulk liquid, in the presence of bubbles. We use computational fluid dynamics, and specifically apply the local front reconstruction method as interface-tracking method. When a single bubble rises near a wall, the thermal boundary layer is sharpened enhancing heat transfer. This enhancement is initially located near the equator of the bubble, and then shifts to the wake of the bubble. Using stream wise periodic boundary conditions for flow and heat transfer, the wall-to-liquid heat transfer for developed flow conditions is quantified as function of gas fraction. The enhancement is strongly correlated with the relative bubble distance from the wall.
| Original language | English |
|---|---|
| Article number | 100037 |
| Number of pages | 15 |
| Journal | Chemical Engineering Science: X |
| Volume | 4 |
| DOIs | |
| Publication status | Published - 1 Nov 2019 |
Funding
This work is part of the Industrial Partnership Programme i36 Dense Bubbly Flows that is carried out under an agreement between Akzo Nobel Chemicals International B.V., DSM Innovation Center B.V., Sabic Global Technologies B.V., Shell Global Solutions B.V., Tata Steel Nederland Technology B.V. and the Netherlands Organisation for Scientific Research (NWO). This work was carried out on the Dutch national e-infrastructure with the support of SURF Cooperative.
Keywords
- Bubbly flows
- Heat transfer enhancement
- Local Front Reconstruction Method
- Periodic boundaries
- Single field formulation