The paper focuses on the behaviour of nonionic surfactants (NISs) for enhanced oil recovery (EOR) processes with special reference to its applicability in the reservoirs of Upper Assam. The present work specifically studies three NISs, viz. Tergitol 15-s-7(Tg7), Tergitol 15-s-9 (Tg9) and Triton X 405(TX), based on their surface tension (ST), dynamic interfacial tension, hydrophilic-lipophilic balance, emulsion stability, aqueous stability, particle size analysis and phase behaviour. Simultaneously, crude oil from an oil field of upper Assam Basin was characterized based on API gravity, kinematic and dynamic viscosities, pour point and acid number. Core flood studies were conducted in the reservoir core to determine the recovery of crude oil during secondary water flood and EOR by NISs. It was observed that Tergitol 15-S-7 when mixed with Triton X-405 (Tg7TX) had the least interfacial tension (IFT) as compared to individual NIS and their mixtures. The recovery was found to be as high as 25.67% after secondary water flood from the original oil in place when Tg7TX followed by chase water was used as an exotic fluid for EOR. This work is an attempt to identify NISs mixtures for EOR for Upper Assam Basin.

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A simplified solar updraft device adapted from the Trombe wall concept was built to process large-scale airflow using only solar energy. The performances were systematically studied using experimental measurements and numerical models, with the focus of investigating whether this device can generate enough airflow under low solar intensities, and developing a fast-analytical mathematical model to effectively and efficiently find design rules for further application. The experimental results prove that the air mass flow rate generated by solar updraft in a 0.9 m 2 solar updraft device can be as high as 75.6 kg/h when the solar radiation is only 120 W/m 2 . A comparison of two numerical models shows that it is feasible to develop a fast-analytical tool based on widely available MATLAB with low demand for computing resources and to provide guidance on how a future device should be designed for particular applications. The study also investigated the effects of a wider range of solar radiation intensities, air channel height and thickness on the updraft performances (e.g., air temperature, airflow velocity, and mass flow rate).