En
  • دکتری (1391)

    مهندسی مکانیک - تبدیل انرژی

    دانشگاه صنعتی شریف، تهران، ایران

  • کارشناسی‌ارشد (1385)

    مهندسی مکانیک - تبدیل انرژی

    دانشگاه صنعتی شریف، تهران، ایران

  • کارشناسی (1383)

    مهندسی مکانیک (حرارت و سیالات)

    دانشگاه صنعتی اصفهان، اصفهان، ایران

  • شبیه سازی عددی جریان های چندفازی
  • فرآیندهای نفت خام (جداسازی آب و نفت، نمک‌زدایی نفت خام، رسوب‌گذاری)
  • توربوماشین (توربین های آبی، توربوکمپرسورها)
  • تهویه صنعتی

    دکتر رضا مداحیان در سال 1383 در مقطع کارشناسی مهندسی مکانیک - حرارت و سیالات از دانشگاه صنعتی اصفهان فارغ التحصیل شد. ایشان تحصیلات دوره کارشناسی ارشد و دکتری خود را در دانشگاه صنعتی شریف گذرانده و در سال 1391 موفق به اخذ مدرک دکتری تخصصی با درجه عالی شد. طی سال های 1392 تا 1394 به عنوان عضو هیات علمی دانشگاه کاشان فعالیت داشته است. از سال 1394 تا کنون به عنوان عضو هیات علمی دانشگاه تربیت مدرس مشغول به فعالیت و پژوهش است. زمینه های تحقیقاتی ایشان پژوهش های عددی و تجربی در حوزه جریان های دو و چندفازی، رسوب گذاری و همچنین توربوماشین های آبی است. علاوه بر فعالیت های آموزشی و پژوهشی در دانشگاه، پروژه های متعدد صنعتی در حوزه های تهویه مطبوع، تهویه صنعتی، سیستم های خنک کن و تبرید و مدلسازی فرآیندی به سرانجام رسانده اند. ایشان هم اکنون به عنوان مدیر گروه تبدیل انرژی فعالیت دارند.

    ارتباط

    رزومه

    Numerical investigation of air-injected deoiling hydrocyclones using population balance model

    R Raesi, R Maddahian
    Journal Papers , , {Pages }

    Abstract

    A new approach to account for porosity variations on the solidification of a skim milk droplet

    S Jafari, H Khaleghi, R Maddahian
    Journal Papers , , {Pages }

    Abstract

    Optimization of Axial Water Injection to Mitigate the Rotating Vortex Rope in a Francis Turbine

    Hessan Jafarzadeh Juposhti, Reza Maddahian, Michel J Cervantes
    Journal PapersRenewable Energy , 2021 May 7, {Pages }

    Abstract

    Rotating Vortex Rope (RVR) resulting from flow instabilities inside draft tube affects the hydraulic turbine’s efficiency and wear. Among the passive and active RVR mitigation methods, the water injection method has been widely investigated lately. The present research focuses on the dynamics of RVR mitigation using the water injection method and the optimization of exergy loss during the water injection. The numerical simulations are performed using a reduced turbine geometry consisting of one stay vane, two guide vanes, one runner passage by applying periodic boundary conditions at side boundaries, and a complete draft tube. The pressure fluctuations, velocity field, and the RVR structure are well captured using the Shear Stress Transpo

    Investigation of thermal interaction between shallow boreholes in a GSHE using the FLS-STRCM model

    O Alaie, R Maddahian, G Heidarinejad
    Journal Papers , , {Pages }

    Abstract

    Developing a 1D-3D model to investigate the effect of entrapped air on pressure surge during the rapid filling of a pipe

    R Maddahian, F Shaygan, DM Bucur
    Journal Papers , , {Pages }

    Abstract

    Tips on Application of Natural Ventilation in Prevalent Buildings in Iran

    SA Mousavian, M Maerefat, R Maddahian, B Mohammadkari
    Journal Papers , , {Pages }

    Abstract

    Numerical investigation of asphaltene fouling growth in crude oil preheat trains using multi-fluid approach

    Reza Maddahian, Ashkan Torabi Farsani, Mahdi Ghorbani
    Journal PapersJournal of Petroleum Science and Engineering , Volume 188 , 2020 May 1, {Pages 106879 }

    Abstract

    In this study, the asphaltene deposition and the fouling layer growth are modeled using the multi-fluid approach. The crude oil is considered as a multi-species fluid which the asphaltene species can deposit on the heat transfer surfaces due to the volume reaction. The effective mechanisms of asphaltene particle transport are the molecular and eddy diffusions. Therefore the species modeling approach is utilized for particles transport by diffusion processes in the carrier phase. To model the fouling layer growth without considering an initial thickness for the deposited layer, extra terms are added to the momentum equations of primary and secondary phases. The results of the numerical model are validated against available experimental data

    Experimental and Numerical Study of Closed Circuit Wet Cooling Tower and Heat Transfer Coefficients Calculation on the Outer Surface of Hot Water Tubes

    M Rashidinejad
    Journal PapersModares Mechanical Engineering , Volume 20 , Issue 4, 2020 April , {Pages 901-913 }

    Abstract

    The closed-circuit cooling tower is described as the combination of both wet and dry cooling towers that hot water passes through the bundle of tubes as in the dry cooling towers and surrounding air passes around them in a forced or natural regimes. Thus, secondary water circulates as an open cycle and is sprayed on the bundle of tubes to preserve the tower cooling process. In the present research, the operation of a model of the closed-circuit wet cooling tower has been investigated numerically and experimentally. The effects of environmental condition on process water temperature, sprayed water temperature and air temperature have been evaluated, and the mass and heat transfer coefficients on the surface of hot water tubes have been calcu

    Experimental and numerical study of closed circuit wet cooling tower and heat transfer coefficients calculation on the hot water tubes outer surface

    Mohsen Rashidinejad, Reza Maddahian, Ali Akbar Abbasian Arani
    Journal PapersModares Mechanical Engineering , Volume 20 , Issue 4, 2020 April 10, {Pages 0-0 }

    Abstract

    Closed circuit cooling tower is described as the combination of both wet and dry cooling tower that hot water passes through the bundle of tubes as in the dry cooling towers and surrounding air passes around them in a forced or natural regimes. Thus, secondary water circulates as an open cycle and is sprayed on the bundle of tubes to preserve the tower cooling process. In the current study, operation of a model of closed circuit wet cooling tower is investigated numerically and experimentally. Effects of environmental condition on process water temperature, sprayed water temperature and air temperature are evaluated, and the mass and heat transfer coefficients on the surface of hot water tubes are calculated. According to these results, sur

    Effect of Swirl on Thermal and Hydraulic Properties of Ice Slurry Flow

    Hazhir Ahmadkermaj, Reza Maddahian, Mehdi Maerefat
    Journal PapersHeat Transfer Engineering , 2020 March 6, {Pages 23-Jan }

    Abstract

    Accumulation of ice particles inside the pipes of an ice slurry refrigeration system is a problem that should be avoided to ensure the efficient performance of the system. In the present research, the swirling flow of ice slurry is numerically investigated using the Eulerian-Eulerian model coupled with the kinetic theory of granular flow. The swirling flow is generated by twisted tapes inserted into a smooth pipe. The results show that by swirling the flow, the ice particle diameter may be increased up to about three times larger than the typical particle diameter used in the ice slurry, without particle accumulation. Moreover, for the swirling flow of ice slurry with the ice particle diameter of 0.3 mm, the rate of mass transfer increase

    Numerical investigation of anode channel clogging of a PEMFC with a realistic droplet size distribution

    Kazem Mohammadzadeh, Hassan Khaleghi, Reza Maddahian, Ebrahim Shirani
    Journal PapersJournal of the Brazilian Society of Mechanical Sciences and Engineering , Volume 42 , Issue 4, 2020 March 28, {Pages }

    Abstract

    In this paper, a parametric study of anode channel clogging of a proton exchange membrane fuel cell (PEMFC) is presented using the numerical volume of fluid method. The droplet size distribution in the present research is considered close to reality. Therefore, three droplets with different sizes are initially placed on the anode channel wall. The droplet sizes are obtained based on the distribution of the saturated liquid water along the whole channel under a specific working condition and the amount of condensed water in the channel, using the PEMFC code. Finally, the dynamic behavior of the droplets is investigated and compared to that of a single droplet with the same total volume. Numerical results show that, in the case of three dropl

    Numerical investigation of a new method to control the condensation problem in ceiling radiant cooling panels

    Mohsen Amini, Reza Maddahian, Simindokht Saemi
    Journal PapersJournal of Building Engineering , 2020 August 2, {Pages 101707 }

    Abstract

    Radiant cooling panels are believed to be of considerable energy saving potentials and can be employed as new cooling devices in HVAC systems. Even though the popularity of radiant cooling systems grows, particularly for cooling and heating commercial buildings, the condensation problem limits their application. The present research is conducted to introduce and evaluate a new method to control the condensation problem in the Ceiling Radiant Cooling Panels (CRCP). A dehumidification coil is integrated with CRCP in order to regulate the water condensation and remove the latent heat load. To evaluate the capability of the new model, the performance of the system was numerically investigated in a sample office, for different wall insulation an

    Effect of heated surface inclination on the growth dynamics and detachment of a vapor bubble, a numerical study

    Ali Asghar Abdoli Tondro, Reza Maddahian, Ali Arefmanesh
    Journal PapersHeat and Mass Transfer , 2020 September 2, {Pages 18-Jan }

    Abstract

    Nucleate boiling is an important part of the pool boiling phenomenon which occurs in various processes involving heat transfer, such as, steam production, chemical processes, etc. The inclination of the heated surface, where bubbles nucleates, significantly affects the bubble growth dynamics as well as the heat transfer rate from the microlayer underneath the bubble during the nucleate boiling. In this study, the effect of the surface inclination on the bubble growth and detachment during the nucleate boiling is investigated numerically. For this purpose, the proposed model of Lay and Dhir for the microlayer is modified to include the effect of the inclination of the heated surface. The resulting equations are solved numerically, and the ef

    Numerical investigation of water droplet behavior in anode channel of a PEM fuel cell with partial blockage

    Ramin Jazmi, Kazem Mohammadzadeh, Hassan Khaleghi, Reza Maddahian
    Journal PapersArchive of Applied Mechanics , 2020 November 11, {Pages 16-Jan }

    Abstract

    In this paper, water droplet behavior and its removal process in the anode gas flow channel (GFC) of a proton exchange membrane fuel cell (PEMFC) with partial blockage are numerically investigated using a three-dimensional volume of fluid model. The governing equations are solved using the finite volume method. The effects of the droplet emergence location (, blockage ratio (, longitudinal ratio (, contact angle ( and current density on the water management characteristics, such as droplet shape, removal time, instantaneous and time-averaged pressure drop and water coverage ratio (WCR), are studied. Researchers have already considered the blocking effect on the PEMFC performance without considering the water droplet movement, but the resul

    Numerical Simulation of Natural Draft Dry Cooling Tower of Yazd Combined Cycle Power Plant: Evaluation of the Louvre Angle Effect

    Reza Maddahian, Ali Akbar Abbasian Arani, Mohsen Rashidinejad
    Journal PapersModares Mechanical Engineering , Volume 20 , Issue 11, 2020 July 10, {Pages 2653-2670 }

    Abstract

    Original Research The main disadvantage of natural draft dry cooling towers is the influence of atmospheric conditions such as ambient temperature and wind speed on the thermal performance. Wind disrupts the natural flow of air inside the tower creating vortices at the back and inside the tower that disrupts the air flow structure. When the wind blows, increasing the velocity of inlet air through the front louvers causes the air to pass through the behind louvers rather than outlet opening. The negative effect of this phenomenon reduces the cooling performance and consequently reduces the turbine production power in power plants. A good solution to this problem is to adjust the Louvers angle correctly. Therefore, in the present study, the t

    Numerical investigation of entrapped air pockets on pressure surges and flow structure in a pipe

    Reza Maddahian, Michel J Cervantes, Diana M Bucur
    Journal PapersJournal of Hydraulic Research , 2019 April 26, {Pages 13-Jan }

    Abstract

    This research presents a numerical investigation of two-phase flow during the expulsion of entrapped air in a non-confined pipe. A modified version of the volume of fluid (VOF) approach is employed considering the effect of compressibility in the liquid. A modification is introduced to the original approach relating the density changes in the liquid to the pressure changes using the fluid bulk modulus. The bulk modulus is also modified to consider the pipe elasticity, the air bubble entrainment and the two-phase flow regime in a pipe. Fluid–structure interaction (FSI) code is developed and used to calculate the motion of the downstream orifice wall during the impact of the water column on the pipe end wall. The numerical results of the pr

    Numerical Simulation of Nanofluid Heat Transfer in a Tube Equipped with Twisted Tape Using the Eulerian-Lagrangian Two-Phase Model

    Gh A Sheikhzadeh, M Nazififard, R Maddahian, Kh Kazemi
    Journal PapersModares Mechanical Engineering , Volume 19 , Issue 1, 2019 January 15, {Pages 53-62 }

    Abstract

    Today, increasing the efficiency and optimization of energy systems in terms of economic and environmental conditions is of particular importance. So far, several methods have been proposed to increase the heat transfer in thermal systems, including the use of nanofluids and types of fluid flow turbulators. In this research, the application of both nanofluid and twisted tape to improve the heat transfer coefficient were numerically investigated. Different turbulence models were used to simulate fluid turbulence. The results showed that increasing the nanoparticle volume fraction, reducing the twisting ratio, and increasing the Reynolds number resulted in an increase in heat transfer. By reducing the twisting ratio from 15 to 5, the heat tra

    Assessment of the inclination surface on the microlayer behavior during nucleate boiling, a numerical study

    Ali Asghar Abdoli Tondro, Reza Maddahian, Ali Arefmanesh
    Journal PapersHeat and Mass Transfer , 2019 January , {Pages 14-Jan }

    Abstract

    Nucleate boiling is an important part of pool boiling process. Heat transfer from the microlayer plays a considerable role in heat transfer to the fluid. The axisymmetric assumption of the microlayer for a horizontal surface needs to be evaluated for an inclined one. In this study, the effect of surface orientation on the microlayer thickness and the heat transfer rate are investigated numerically. The governing equations are simplified employing scaling analysis. The results for the microlayer thickness, the heat flux and the total heat transfer rate for the heated surface are obtained and presented. The asymmetry of the microlayer increases as the surface inclination angle varies from horizontal to vertical. Even though, the driving force

    Assessment of the inclination surface on the microlayer behavior during nucleate boiling, a numerical study

    Ali Asghar Abdoli Tondro, Reza Maddahian, Ali Arefmanesh
    Journal PapersHeat and Mass Transfer , 2019 January , {Pages }

    Abstract

    Nucleate boiling is an important part of pool boiling process. Heat transfer from the microlayer plays a considerable role in heat transfer to the fluid. The axisymmetric assumption of the microlayer for a horizontal surface needs to be evaluated for an inclined one. In this study, the effect of surface orientation on the microlayer thickness and the heat transfer rate are investigated numerically. The governing equations are simplified employing scaling analysis. The results for the microlayer thickness, the heat flux and the total heat transfer rate for the heated surface are obtained and presented. The asymmetry of the microlayer increases as the surface inclination angle varies from horizontal to vertical. Even though, the driving force

    Comparative Analysis of a Single Fuel Droplet Evaporation

    Somayeh Jafari, Reza Maddahian
    Journal PapersJournal of Chemical and Petroleum engineering , Volume 53 , Issue 1, 2019 January , {Pages 81-90 }

    Abstract

    In this research, the results of comparative analysis of a single fuel droplet evaporation models are presented. Three well-known evaporation models including Spalding, Borman-Johnson and Abramzon-Sirignano models are analyzed using Computational Fluid Dynamic (CFD). The original Spalding model is extended to consider the effects of the Stefan flow, unsteady vaporization, and variable properties. The evaporation models are validated using already existing experimental data. Numerical results show that the Spalding model overestimates the temperature of the droplet surface in comparison with the other two models, although some modifications were made in the aforementioned model. Our final evaluation concludes that Abramzon-Sirignano model pr

    /pro/academic_staff/maddahian/publication

    دروس نیمسال جاری

    • كارشناسي ارشد
      ديناميك سيالات محاسباتي I ( واحد)
      دانشکده مهندسی مکانیک، گروه تبديل انرژي

    دروس نیمسال قبل

    • كارشناسي ارشد
      مكانيك سيالات پيشرفته ( واحد)
      دانشکده مهندسی مکانیک، گروه تبديل انرژي
    • كارشناسي ارشد
      تهويه مطبوع پيشرفته ( واحد)
    • 1400
      كاظمي, ايليا
      شبيه‌سازي عددي پديده خودهوادهي در فرآيند شناورسازي ذرات
    • 1401
      ال تارويردي, سپهر
    • 1401
      حسيني, احمد
    • 1401
      حيدريان, مهدي
    • 1401
      دالوند, علي
      داده ای یافت نشد
      داده ای یافت نشد

    مهم

    جدید

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