Browsing by Author "Babazadeh, H"

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    Energy storage analysis for discharging of nanoparticle enhanced phase change material within a triplex-tube thermal storage
    Zhang, XJ; Sheikholeslami, M; Yan, WM; Shafee, A; Selimefendigil, F; Babazadeh, H
    In current transient modeling, discharging of PCM based on FEM has been scrutinized. Due to importance of phenomenon near the solid front, time linked mesh has been employed and to reduce the thermal irreversibility, copper oxide nanomaterial was dispersed into H2O. Outputs indicate that using wavy wall and dispersing Platelet copper oxide are capable for expedition of discharging. Obtaining the completed solidification in minimum time is main criteria for designing a storage unit. Changing shape of nanoparticle from spherical to Platelet can reduce the solidification duration about 5.96%. Utilizing greater amplitude of sinusoidal wall can reduce the discharging time by about 7.58% which is related to stronger conduction mechanism. Inclusion of nanoparticles, not only improve the phase change rate but also decline the irreversibility due to lower temperature of domain. Needed time declines about 22.7% with disperse of platelet CuO. As shape of powder changes from platelet to sphere, required time alters from 337.41 s to 358.8 s. The solidification rate for A = 0.3 is 1.06 times greater than that of A = 0.1.
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    Phase change process of nanoparticle enhanced PCM in a heat storage including unsteady conduction
    Shafee, A; Sheikholeslami, M; Wang, P; Selimefendigil, F; Babazadeh, H
    Thermal energy release process during solidification of water has been simulated in current investigation. Time-linked equation was solved via Galerkin approach and automatic time step has been considered. To augment thermal characteristics, NEPCM has been fabricated by embedding copper oxide in to water. Low deviation with experimental data confirms the accuracy of current code. With reduce of concentration of nanomaterial, process prolonged and higher temperature of domain has been reported. Selecting greater shape factor yields to stronger conduction mode which can result unit with lower solidification time. There was an approximate 1.34% reduction in discharging time with augment of shape factor and such percentage reaches to 4.6% for nanomaterial with 0.04 volume fraction. There is reducing tendency in time of solidification with augment of concentration of nanomaterial and outputs showed that 14.39% reduction for platelet CuO nano powders. Energy released reduces as time augments due to reduction in mass of liquid phase. (C) 2020 Elsevier B.V. All rights reserved.
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    Numerical modeling of turbulent behavior of nanomaterial exergy loss and flow through a circular channel
    Shafee, A; Sheikholeslami, M; Jafaryar, M; Selimefendigil, F; Bhatti, MM; Babazadeh, H
    To understand the impacts of adding twisted tape inside the tube with hybrid nanomaterial, the present paper has been examined with considering FVM. New testing fluid instead of water leads to lower exergy loss. Modeling outputs were carried out for different pitch ratio and Reynolds number. Decrement trend for secondary flow was reported when pitch ratio increases, and for this reason, convective flow reduces with rise ofPwhich results in greater exergy drop. Turbulence intensity improves with augment of Re which provides stronger interaction of nanomaterial and tube wall. So, thinner boundary layer appears with rise of Re and exergy loss deteriorates.
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    Solidification of PCM with nano powders inside a heat exchanger
    Hajizadeh, MR; Selimefendigil, F; Muhammad, T; Ramzan, M; Babazadeh, H; Li, Z
    Present research was devoted to modeling investigation of paraffin solidification within a wavy channel. Paraffin was mixed with CuO nano powders and creates NEPCM. Changing the surface of duct and working PCM is the main factors of this paper for improving the performance. The outer duct contains NEPCM and air within inner side can be warmer due to discharging process. The outputs indicate that wavy duct has better performance than the straight one due to its shorter solidification duration. Utilizing wavy duct and NEPCM can help the solidification and enhance the rate of process about 38%. Inclusion of nanomaterial leads to lower discharging time. (C) 2020 Elsevier B.V. All rights reserved.