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ABSTRACT
The aim of this work is to evaluate the role of viscosity of the organic condensate obtained from fast pyrolysis of wheat straw. Based on the experimental data, a model has been developed that is able to adequately describe the viscosity as a function of relevant process parameters. The developed model is helpful to investigate the reduction of heat transfer in the heat exchangers of the organic condensate cycle when glycol is replaced by an organic condensate. Temperature, solid contents, and water contents play a significant role and affect the viscosity of bio-oil. As temperature increases, the viscosity of oil reduces rapidly. Viscosity-temperature profile follows an Arrhenius-type-relationship, where the viscosity of the bio-oil decreases exponentially with increasing temperature. As solid content increases, exponential increase of viscosity takes place. However, the increase in water content results in decrease of viscosity on logarithmic scale. The range of water addition in organic condensate is possible up to a certain limit, after certain limit it starts to separate out in two phases. Investigation of reduction of heat transfer in heat exchanger shows that Nusselt number decreases with the increase of viscosity. Therefore, the overall heat transfer coefficient will decrease in case of organic condensate as compared to glycol.
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Notes on contributors
Muhammad Rizwan Younis
Muhammad Rizwan Younis is lecturer at University of Management and Technology Lahore Pakistan. His is working in the area of bio fuels, biomass and renewable energy.
Muhammad Farooq
Dr Muhammad Farooq is an experienced academic with more than 10 years of research, industrial and teaching experience at prestigious organizations in different world-renowned organizations. Currently, he is working as an Assistant Professor at Mechanical Engineering Department, University of Engineering and Technology Lahore, Pakistan. His research interest include carbon capture, bio fuels, bio-energy, and waste heat to power conversion technologies.
Muhammad Imran
Dr Muhammad Imran is established researcher in the area of thermal energy systems. His research activities aimed at developing innovative thermal energy systems and improving the energy performance of existing energy systems. He is particularly interested in the waste and low temperature heat to power conversion technologies, hybrid energy systems, CHP system, district heating and cooling, heat pump, and thermal energy storage.
Ali Hussain Kazim
Ali Hussain Kazim Kazim is currently working as an Assistant Professor in the Department of Mechanical Engineering, University of Engineering and Technology, Lahore. His research focus on waste heat to power conversion technologies, heat transfer, energy efficiency, and nanotechnology.
Aqsa Shabbir
Dr Aqsa Shabbir is working as Assistant Professor in the Department of Electrical Engineering, Lahore College for Women University, Lahore, Pakistan. Her research primarily focus on Machine Learning, Image Processing, Data Mining, and Nuclear Fusion Plasmas.