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Articles by M. M. Rahman
Total Records ( 3 ) for M. M. Rahman
  M.S. Alam , M.A.K. Chowdhury , Sushanta Kumar Saha , Md. Saifuzzaman and M. M. Rahman
  In this research work, a mathematical model for simulation of solar radiation system has been developed by using system dynamics methodology. Bangladesh is used here for model validation. The simulated results obtained from this model have compared with the experimental results and found reasonably a good agreement. Therefore the performance of the model is to be expected as satisfactory.
  M. M. Rahman , Khalaf I. Hamada , M. M. Noor , Rosli A. Bakar , K. Kadirgama and M. A. Maleque
  This study presented in-cylinder heat transfer characteristics of a single cylinder port injection Hydrogen fueled Internal Combustion Engine (H2ICE) using a steady state approach. Problem statement: The differences in characteristics between hydrogen and hydrocarbon fuels are led to the difference in the behavior of physical processes during engine cycle. One of these processes is the in-cylinder heat transfer. Approach: One dimensional gas dynamic model was used to describe the heat transfer characteristics of the engine. The engine speed was varied from 2000-5000 rpm, crank angle from -40° to +100°, while Air-Fuel Ratio (AFR) was changed from stoichiometric to lean limit. Results: The simulated results showed higher heat transfer rate but lower heat transfer to total fuel energy ratio with increasing the engine speed. The in-cylinder pressure and temperature were increased with decreasing AFR and increasing engine speed. The in-cylinder air flow rate was increased linearly with increasing engine speed as well as air fuel ratio. Conclusion/Recommendations: The results showed that the AFR has a vital effect on characteristics variation while the engine speed has minor effect. These results can be utilized for the study of combustion process, fuel consumption, emission production and engine performance.
  R. Khanom , M. J. Abedin Mian , M. M. Rahman and M. R. Islam
  A laboratory experiment was carried out on ion [viz. NH4+, C, Ca2+, P (HPO42– + H2PO4–), SO42– and NO3–] sorption behaviour of Old Brahmaputra Floodplain soil with a view to examine the amount of ion sorbed by soil when recommended doses of N, P, K and S fertilizers are applied at different moisture regimes i.e. 5 cm standing water (low concentration), saturated condition (medium concentration) and field capacity (high concentration). Results showed that there was a wide variation in ion sorption for different moisture regimes as well as times. In general, the sorption of different cations and anions increased with the increase in ionic concentration i.e. ionic strengths of the solution and the maximum sorption was found at saturated condition (medium concentration). The sorption of Ca2+ was the highest followed by NH4+ and K+. Among the anions the P sorption was the highest followed by NO‾ and SO4–2.
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