Dr. Tian Ma

Head Bubbles go with the turbulent flows
Junior Group Lea­der – bubbles go with turbulent flows
Phone: +49 351 260 3805

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Junior research group: Bubbles go with turbulent flows

We are interested in solving fundamental and applied problems related to turbulence and bubble transport in environmental and industrial flows. We use experiments (mostly) of bubble-laden turbulent flows to understand how the bubbles modify the multiscale properties of the turbulent flows, as well as the motion of the bubbles themselves. The aim is both to enhance our fundamental understanding of bubble-turbulence interaction and provide new modeling approaches for a wide range of fields in nature and industrial processes.


Group leader: Dr. Tian Ma

Postdoc: Dr. Hendrik Hessenkemper

PhD: Lantian Wang

Foto: BubFind ©Copyright: Dr. Hendrik Hessenkemper

Experimental methods for optical measurements in bubbly flows

To obtain high resolution flow data of dispersed bubble flows, we use optical measurements and develop suitable processing tools. This involves PIV-like methods and Lagrangian Particle Tracking for the liquid phase and deep learning models for detecting and tracking individual bubbles under strong occlusion.
Foto: Velo field ©Copyright: Dr. Hendrik Hessenkemper

Multiscale properties of turbulence in bubble-laden flows

We investigate the properties of bubble-laden turbulent flows at different scales, focusing on the flow kinetic energy, anisotropy, energy transfer and extreme events.
Foto: Cluster GIF ©Copyright: Dr. Hendrik Hessenkemper

Collective dynamics of bubble swarms

We study the evolution of bubble clusters in a swarm of freely rising bubbles under different flow conditions. Our machine learning-aided algorithm allows us to identify and track bubbles in clusters and measure the clus­ter lifetime/orientation.
Foto: LiftSketch ©Copyright: Dr. Hendrik Hessenkemper

Experimental studies on bubble forces in low-viscosity systems

In order to obtain accurate and reliable closure models, we design dedicated experiments and processing procedures for bubble forces and bubble interactions.
Foto: Bubble-induced turbulence - link ©Copyright: Torsten Berger

Turbulence modelling in bubbly flows

A new model to consi­der the bubble induced turbulence (BIT) was recently derived basing on data from direct numerical simulations (DNS). Basing on the shear stress turbulence (SST) model additional source terms are proposed for BIT.