http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/580 Volume 9, Number 2, December 2021 Sun, 26 Apr 2026 00:19:20 GMT 2026-04-26T00:19:20Z http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/688 Performance Analysis of a Low Head Water Vortex Turbine Saha, Badhan; Islam, Mazharul; Nimul Islam, Khondoker; Naim, Jubair; Farabi, MD Shahriar A small hydropower plant is an environment-friendly renewable energy technology. The run-of-river type gravitational water vortex turbine can be designed to produce electricity at sites with low water heads. In this study, an experimental investigation was undertaken on this type of turbine with a water tank and a runner which is connected to a shaft. At the end of the shaft, a rope brake was attached to measure the output power, torque and overall efficiency of the vortex turbine by varying flow rates. The designed vortex turbine can achieve an overall efficiency of 52.67%. The experimental results were validated with available data in the literature and theories associated with the turbine. The results also showed that the flow rate plays a vital role in generating power, torque as well as overall efficiency. The project was completed using local resources and technologies. Moreover, as water is used as the input power, this project is eco-friendly which has no adverse effect on the environment. Wed, 01 Dec 2021 00:00:00 GMT http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/688 2021-12-01T00:00:00Z http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/687 Computational Design Approach to Re-Establish the Urban Fabric of Mongla: A Perspective from Grasshopper Azad, Sumaiya Binte The Padma Multipurpose Bridge Project is the genesis of some subsequent projects in Bangladesh among which developing Mongla Port is one of the priority values. Since Mongla is an integral part of southern Bangladesh, the government has taken initiatives to integrate the port uses for neighboring countries. An agreement was signed (Intra Bangladesh, Butan, India, and Nepal (BBIN) Trade) for offering multi-modal transit access to India and Port access to Nepal, Bhutan and Eastern India. The objective of this study is to establish a computational way to analyze the existing fabric and restore a potential optimized fabric. The methodology of this study includes developing a computational approach, collecting data from secondary sources, analyzing the data set and adjusting it to the identified existing urban fabric. In this paper, a new tool is introduced named ‘Physarealm’, based on the algorithm of Grasshopper and Rhinoceros. Wed, 01 Dec 2021 00:00:00 GMT http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/687 2021-12-01T00:00:00Z http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/686 Predicting Fully-developed Channel Flow with Zero-equation Model Rahman, M. M.; Hasan, K.; Liu, Wenchang; Li, Xinming A new zero-equation model (ZEM) is devised with an eddy-viscosity formulation using a stress length variable which the structural ensemble dynamics (SED) theory predicts. The ZEM is distinguished by obvious physical parameters, quantifying the underlying flow domain with a universal multilayer structure. The SED theory is also utilized to formulate an anisotropic Bradshaw stress-intensity factor, parameterized with an eddy-to-laminar viscosity ratio. Bradshaw’s structure-function is employed to evaluate the kinetic energy of turbulence k and turbulent dissipation rate 𝜺𝜺. The proposed ZEM is intrinsically plausible, having a significant impact on the prediction of wall-bounded turbulence. Wed, 01 Dec 2021 00:00:00 GMT http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/686 2021-12-01T00:00:00Z http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/685 Effect of Boric Acid Solubility in Steam on the Process of Mass Transfer during Emergency Cooling of VVER-1200 Nuclear Reactor Kabir Hridoy, Md. Rezouanul; A.V., Morozov; Kabir, Md Saif The mechanisms of boric acid mass transfer in a VVER-1200 reactor core are studied in this work in the event of a major circulatory pipeline rupture and loss of all AC power. The VVER-1200's passive core cooling technology is made up of two levels of hydro accumulators. They use boric acid solution with a concentration of 16 g H3BO3/kg H2O to control the reactivity. Because of the long duration of the accident process, the coolant with high boron content starts boiling and steam with low concentration of boric acid departs the core. So, conditions could arise in the reactor for possible accumulation and subsequent crystallization of boric acid, causing the core heat removal process to deteriorate. Calculations were carried out to estimate the likelihood of H3BO3 build-up and subsequent crystallization in the core of the VVER reactor. According to the calculations, during emergency the boric acid concentration in the reactor core is 0.153 kg/ kg and 0.158 kg/kg in both the events of solubility of steam and without solubility of steam respectively and it does not exceed the solubility limit which is about 0.415 kg/kg at water saturation temperature. No precipitation of boric acid occurs within this time during the whole emergency process. Therefore, findings of the study can be used to verify whether the process of decay heat removal is affected or not. Wed, 01 Dec 2021 00:00:00 GMT http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/685 2021-12-01T00:00:00Z