Saidur Rahman - Academia.edu (original) (raw)

Papers by Saidur Rahman

Applied Thermal Engineering, 2011

Aviation Turbine Fuel (ATF)-Al2O3 nanofluids are investigated for better heat transfer performanc... more Aviation Turbine Fuel (ATF)-Al2O3 nanofluids are investigated for better heat transfer performance in a potential application of regeneratively cooled semi-cryogenic rocket engine thrust chambers. The volume concentration of Al2O3 nanoparticles is varied between 0 and 1%. To ensure a realistic evaluation, all properties of the nanofluids are experimentally measured rather than resorting to available formulae or empirical correlations. Among the

Numerical Heat Transfer, Part A: Applications, 2012

Clean Technologies and Environmental Policy, 2011

Renewable and Sustainable Energy Reviews, 2014

ABSTRACT Drying is an essential process in the preservation of agricultural crops and in industri... more ABSTRACT Drying is an essential process in the preservation of agricultural crops and in industries, such as textile production, dairy processing, cement production, clay brick production, tile production, wood and timber processing, wastewater treatment, and biomass treatment. The energy requirement for drying can be supplied from various sources, namely, electricity, fossil fuel, natural gas, wood, bark forest residual, and solar. Although the use of solar radiation for drying has existed since antiquity, it has not yet been widely commercialized, particularly in the industrial sector. Considering the rapid depletion of natural fuel resources and because of the rising fossil fuel cost, solar drying is expected to become indispensable in the future. Moreover, environmental considerations and damages caused by human beings due to increasing consumption of fossil fuel prompt governments and industries to use renewable energies as a clean and sustainable resource, thus, the use of solar energy for drying. The numerous solar drying applications are classified into two main categories, that is, agricultural and industrial. Many benefits could be exploited from solar energy for drying applications. Solar energy enables the industries and agricultural sectors to modify their energy requirement, improve their energy stability, and increase energy sustainability, which lead to improvement in the system efficiency. We review the role of the drying system in industry and agriculture, the energy consumption capacity, and the availability of the required energy for the products to be dried. In addition, the economical, environmental, and political aspects of using solar dryers are discussed. Special attention is given to industrial drying and in finding opportunities to use compatible dryers for a certain industry. In short, we conduct a comprehensive review of the new approach to use solar energy in industrial drying sector.

Numerical Heat Transfer, Part A: Applications, 2015

International Communications in Heat and Mass Transfer, 2014

2011 IEEE Conference on Clean Energy and Technology (CET), 2011

Abstract Energy efficiency improvement as well as energy savings is the major concern in most of ... more Abstract Energy efficiency improvement as well as energy savings is the major concern in most of the development countries all over the world. In this study, the useful concept of energy and exergy utilization is analyzed to investigate the energy and exergy efficiency, energy and exergy losses and energy savings of boilers. The energy and exergy efficiencies of a combustion chamber and stream production chamber of the boiler have been analyzed as well. The exergy efficiency of the combustion chamber is found to be 49.6%. The ...

Renewable and Sustainable Energy Reviews, 2010

Renewable and Sustainable Energy Reviews, 2013

ABSTRACT Due the advances in the industrial processes, in which the cement industry is a major co... more ABSTRACT Due the advances in the industrial processes, in which the cement industry is a major contributor, energy consumption and greenhouse gas emission has increased significantly. This paper reviews previous studies on energy saving, carbon dioxide emission reductions and the various technologies used to improve the energy efficiency in the cement industry. Energy efficiency measures for raw materials preparation, clinker production, products and feedstock changes, general energy efficiency measures, and finish grinding have been surveyed. It was found that the largest recorded amounts of thermal energy savings, electrical energy savings and emission reductions to date are 3.4 GJ/t, 35 kW h/t and 212.54 kgCO(2)/t, respectively.

Renewable and Sustainable Energy Reviews, 2011

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 2014

ABSTRACT The mixture of nanoparticles in a uid can improve the h of the uid. In this paper, the h... more ABSTRACT The mixture of nanoparticles in a uid can improve the h of the uid. In this paper, the h of water, Al-water, Al2O3-water, Fe3O4-water and TiO2-water nano uids with 0.04 volume fraction of nanoparticles have been analytically calculated for a shell and tube heat exchanger. Moreover, the energy e ectiveness and environmental e ects have also been calculated for the above nano uids. It is found that, the h of the above nano uids were approximately 17, 14, 13, and 10% higher compared to pure water, respectively. Furthermore, energy e ectiveness also improved by 31, 35, 41, and 37%, respectively. If all sectors could use nano uids in their heat exchanger systems, then signi cant amounts of heat emission could be reduced all over the world. Therefore, nano uid can be used as a coolant to improve the performance of the heat exchanger system.

International Journal of Heat and Mass Transfer, 2014

International Journal of Heat and Mass Transfer, 2013

International Journal of Heat and Mass Transfer, 2012

International Journal of Computer Mathematics, 2007

International Communications in Heat and Mass Transfer, 2013

ABSTRACT Heat transfer performance with nanofluids depends on the thermo physical properties of t... more ABSTRACT Heat transfer performance with nanofluids depends on the thermo physical properties of the suspension. Surface tension is an important property for heat transfer calculation. In this paper, various parameters that effect on the surface tension of nanofluids such as nanofluid preparation method, effect of volume fraction, temperature, and surfactants on nanofluids have been studied. Additionally, precise assessments on the theoretical correlations related to the surface tension of nanofluids have also been included. Based on the existing experimental results, surface tension augments respectively with volume fraction intensification. Surface tension of nanofluids decreases accordingly with the increase of temperature and surfactant concentration. Nevertheless, there have been some contradictory results on the effect of volume fraction and surfactant on surface tension of nanofluids.

International Communications in Heat and Mass Transfer, 2010

The present work is aimed to study mixed convection heat transfer characteristics within a ventil... more The present work is aimed to study mixed convection heat transfer characteristics within a ventilated square cavity having a heated hollow cylinder. The heated hollow cylinder is placed at the center of the cavity. In addition, the wall of the cavity is assumed to be adiabatic. Flows are imposed through the inlet at the bottom of the left wall and