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Breakup of fractal aggregates in laminar and turbulent flow has been investigated experimentally by three dimensional particle tracking velocimetry (3D-PTV). The motivation of the thesis is to understand the breakup mechanism in Lagrangian frame so that the entire history of the flow dynamics around the aggregate can be unveiled. This will render access to the intriguing evolution of the character of the key parameters responsible for breakup. Our current understanding on aggregate breakup within the scope of experiment and numerics is limited to measuring the average size distribution and proposing the so called breakage kernels accordingly. This is where we bring forward the essential question which is: What is the Lagrangian contribution of the flow field to which an aggregate is exposed to for a certain time before it breaks apart?

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