My name is Ehsan Houshfar and I welcome you to my personal home page. I have published here my CV. You will also find my list of publications.I'm currently an Assistant Professor of Mechanical Engineering at the University of Tehran.I believe in developing new ideas and building from mistakes. I also believe that growing in life is trying and trying again to open new doors. If you do not close this door, if you discover a wall behind it or if you don't explore entirely the room thus unveiled, it does not matter. The important, vital gesture, is to open the door.I will update this site on a regular basis, trying to reflect my path in life. Feel free to send me feedback. Supervisors: Terese Løvås and Øyvind Skreiberg
Utilizing nanofluids in heat exchangers can lead to improved thermal performance. Nanofluids with... more Utilizing nanofluids in heat exchangers can lead to improved thermal performance. Nanofluids with suspended carbon nanotubes are specifically desirable in thermal systems because of their unique capabilities. In this study, convective heat transfer and required pumping power are studied simultaneously for a helical coiled heat exchanger with laminar water flow while incorporating 0.1 and 0.3 percent volume fraction of the hybrid nanofluid MWCNT + Fe3O4/water. Two different geometries of bare and ribbed tubes are used for the heat exchanger part. The ribs are chosen to be orthogonal, i.e., 90° with respect to the inclined ones. Three different Reynolds numbers are selected for investigation, all in laminar flow regime based on the non-dimensional M number defined in coiled tubes. Computational fluid dynamics is used to study thermal and fluid behavior of the problem. The convective heat transfer coefficient can serve as a criterion to measure the effectiveness of utilizing nanofluids...
The first purpose of this article is to compare two thermodynamic models: one based on the minimi... more The first purpose of this article is to compare two thermodynamic models: one based on the minimization of Gibb's free energy (global equilibrium analysis—GEA) and one stoichiometric equilibrium model solely based on the Water-Gas-Shift reaction. It is shown that the results are essentially identical as long as the syngas temperature of interest is in the range 600 °C to 1500 °C. In other words, using a complex model with a large number of reactions and species does not give more insight than using a simple water-gas-shift reaction and 4 species (CO2, CO, H2O and H2). It should, however, be noted that the experimental measurements of the syngas composition show that the gas stream leaving the gasification chamber, contains other species for example, CH4 and C2s. So, all the syngas species are not at chemical equilibrium and using a minimum Gibbs free energy method is not totally accurate. The second aim of this study is to discuss the influence of temperature on syngas chemistry...
Utilizing nanofluids in heat exchangers can lead to improved thermal performance. Nanofluids with... more Utilizing nanofluids in heat exchangers can lead to improved thermal performance. Nanofluids with suspended carbon nanotubes are specifically desirable in thermal systems because of their unique capabilities. In this study, convective heat transfer and required pumping power are studied simultaneously for a helical coiled heat exchanger with laminar water flow while incorporating 0.1 and 0.3 percent volume fraction of the hybrid nanofluid MWCNT + Fe3O4/water. Two different geometries of bare and ribbed tubes are used for the heat exchanger part. The ribs are chosen to be orthogonal, i.e., 90° with respect to the inclined ones. Three different Reynolds numbers are selected for investigation, all in laminar flow regime based on the non-dimensional M number defined in coiled tubes. Computational fluid dynamics is used to study thermal and fluid behavior of the problem. The convective heat transfer coefficient can serve as a criterion to measure the effectiveness of utilizing nanofluids...
The first purpose of this article is to compare two thermodynamic models: one based on the minimi... more The first purpose of this article is to compare two thermodynamic models: one based on the minimization of Gibb's free energy (global equilibrium analysis—GEA) and one stoichiometric equilibrium model solely based on the Water-Gas-Shift reaction. It is shown that the results are essentially identical as long as the syngas temperature of interest is in the range 600 °C to 1500 °C. In other words, using a complex model with a large number of reactions and species does not give more insight than using a simple water-gas-shift reaction and 4 species (CO2, CO, H2O and H2). It should, however, be noted that the experimental measurements of the syngas composition show that the gas stream leaving the gasification chamber, contains other species for example, CH4 and C2s. So, all the syngas species are not at chemical equilibrium and using a minimum Gibbs free energy method is not totally accurate. The second aim of this study is to discuss the influence of temperature on syngas chemistry...
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