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35 CHAPTER 3. CONCLUSION & FUTURE WORK The results presented in this thesis indicate that hydrodynamic cavitation assist in exfoliating graphene in aqueous state. This was done using an inexpensive cavitation model which uses a needle valve. Additionally, an optimized cavitation model using a venturi tube is proposed in this thesis with analytical evidence of the effectiveness of the venturi tube in microbubble propagation. Further analytical evidence is presented in the effects of flow rate and temperature in optimizing cavitation at the venturi tube. Despite the promising results found using the cavitation model using the needle valve, a major drawback in this setup was that a centrifugal pump was used instead of a positive displacement pump, for in centrifugal pumps, flow tends to vary with pressure. In an optimized cavitation model, it is crucial that a constant flow is been supplied. Due to these factors for future experimentation it is recommended that while implementing the proposed venturi tube for the cavitation model a positive displacement pump is being used. Also, as the system pressure is not significantly high it is safe to assume the usage of PVC piping in designing the system should suffice in meeting the pressure requirements. This will help in reducing the production cost of the model.PDF Image | Hydrodynamic cavitation exfoliation layered graphene nano
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