Relevant bibliographies by topics / Thermodynamically and hydrodynamically developing flow

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Thermodynamically and hydrodynamically developing flow'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Thermodynamically and hydrodynamically developing flow"

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Altaç, Zekeriya, and Özge Altun. "Hydrodynamically and thermally developing laminar flow in spiral coil tubes." International Journal of Thermal Sciences 77 (March 2014): 96–107. http://dx.doi.org/10.1016/j.ijthermalsci.2013.10.020.

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Kumar Parwani, Ajit, Prabal Talukdar, and P. M. V. Subbarao. "Estimation of transient boundary flux for a developing flow in a parallel plate channel." International Journal of Numerical Methods for Heat & Fluid Flow 24, no. 3 (April 1, 2014): 522–44. http://dx.doi.org/10.1108/hff-01-2012-0020.

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Purpose – The purpose of this paper is to develop a numerical model for estimating the unknown boundary heat flux in a parallel plate channel for the case of a hydrodynamically and thermally developing laminar flow. Design/methodology/approach – The conjugate gradient method (CGM) is used to solve the inverse problem. The momentum equations are solved using an in-house computational fluid dynamics (CFD) source code. The energy equations along with the adjoint and sensitivity equations are solved using the finite volume method. Findings – The effects of number of measurements, distribution of measurements and functional form of unknown flux on the accuracy of estimations are investigated in this work. The prediction of boundary flux by the present algorithm is found to be quite reasonable. Originality/value – It is noticed from the literature review that study of inverse problem with hydrodynamically developing flow has not received sufficient attention despite its practical importance. In the present work, a hydrodynamically and thermally developing flow between two parallel plates is considered and unknown transient boundary heat flux at the upper plate of a parallel plate channel is estimated using CGM.
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Thompson, B. R., D. Maynes, and B. W. Webb. "Characterization of the Hydrodynamically Developing Flow in a Microtube Using MTV." Journal of Fluids Engineering 127, no. 5 (May 5, 2005): 1003–12. http://dx.doi.org/10.1115/1.1989368.

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Micro-molecular tagging velocimetry (μMTV) has been used to characterize the hydrodynamic developing flow in a microtube inlet with a nominal inner diameter of 180μm. Velocity profile data at 11 axial locations within the hydrodynamic developing region were acquired using the μMTV approach and the results represent the first characterization of hydrodynamically developing pipe flow at the microscale. The uncertainty in measurements of time-averaged velocity profiles ranged from 6% to 7% of the centerline velocity. The uncertainty in instantaneous measurements is in the range 8%–16% of the peak maximum velocity. Data were taken at Reynolds numbers of 60, 100, 140, 290, and 350. The data suggest the formation of a vena contracta with either locally turbulent flow or unsteady laminar flow separation early in the tube for the larger Reynolds (Re) numbers, which is quite different from macroscale experiment or numerical simulation where a vena-contracta is not observed for Re<500. The velocity profiles obtained very near the tube entrance exhibited a uniform velocity core flow surrounded by regions of relatively stagnant fluid in the near wall regions. The size of the inferred recirculation zones, measured velocity rms, and maximum shear rates all exhibit increasing magnitude with increasing Reynolds number. The velocity profiles were observed to evolve in the downstream direction until the classical parabolic distribution existed. The total hydrodynamic entry length agrees well with values published in the literature for laminar flow with a uniform inlet velocity, despite the existence of the observed vena contracta.
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Selimli, Selcuk, Ziyaddin Recebli, and Erol Arcaklioglu. "MHD numerical analyses of hydrodynamically developing laminar liquid lithium duct flow." International Journal of Hydrogen Energy 40, no. 44 (November 2015): 15358–64. http://dx.doi.org/10.1016/j.ijhydene.2015.02.020.

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Na, Y., and J. Y. Yoo. "Numerical simulation of the hydrodynamically developing flow of a viscoelastic fluid." KSME Journal 4, no. 1 (March 1990): 54–61. http://dx.doi.org/10.1007/bf02953391.

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Fann, Shin, and Wen-Jei Yang. "HYDRODYNAMICALLY AND THERMALLY DEVELOPING LAMINAR FLOW THROUGH ROTATING CHANNELS HAVING ISOTHERMAL WALLS." Numerical Heat Transfer, Part A: Applications 22, no. 3 (October 1992): 257–88. http://dx.doi.org/10.1080/10407789208944768.

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Hwang, T. H. "Laminar droplet flow in combined hydrodynamically and thermally developing region of circular tubes." International Communications in Heat and Mass Transfer 17, no. 6 (November 1990): 703–10. http://dx.doi.org/10.1016/0735-1933(90)90017-e.

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Almalowi, Saeed J., and Alparslan Oztekin. "Flow Simulations Using Two Dimensional Thermal Lattice Boltzmann Method." Journal of Applied Mathematics 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/135173.

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Lattice Boltzmann method is implemented to study hydrodynamically and thermally developing steady laminar flows in a channel. Numerical simulation of two-dimensional convective heat transfer problem is conducted using two-dimensional, nine directional D2Q9 thermal lattice Boltzmann arrangements. The velocity and temperature profiles in the developing region predicted by Lattice Boltzmann method are compared against those obtained by ANSYS-FLUENT. Velocity and temperature profiles as well as the skin friction and the Nusselt numbers agree very well with those predicted by the self-similar solutions of fully developed flows. It is clearly shown here that thermal lattice Boltzmann method is an effective computational fluid dynamics (CFD) tool to study nonisothermal flow problems.
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Chen, X. Y., K. C. Toh, C. Yang, and J. C. Chai. "Numerical Computation of Hydrodynamically and Thermally Developing Liquid Flow in Microchannels With Electrokinetics Effects." Journal of Heat Transfer 126, no. 1 (February 1, 2004): 70–75. http://dx.doi.org/10.1115/1.1643909.

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Developing fluid flow and heat transfer with temperature dependent properties in microchannels with electrokinetic effects is investigated numerically. The electrokinetic effect on liquid flow in a parallel slit is modeled by the general Nernst-Planck equation describing anion and cation distributions, the Poisson equation determining the electrical potential profile, the continuity equation, and the modified Navier-Stokes equation governing the velocity field. A Finite-Volume Method is utilized to solve the proposed model.
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Papadopoulos, P. K., and P. M. Hatzikonstantinou. "Numerical Investigation of the Thermally Developing Flow in a Curved Elliptic Duct With Internal Fins." Journal of Heat Transfer 129, no. 6 (October 17, 2006): 759–62. http://dx.doi.org/10.1115/1.2717254.

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The hydrodynamically fully developed and thermally developing flow inside a curved elliptic duct with internal longitudinal fins is studied numerically. The duct is subjected to the uniform temperature boundary condition on its wall and fins. The local and mean Nusselt numbers are examined for various values of the Dean and Prandtl numbers, the cross-sectional aspect ratio, and the fin height. The characteristics of the optimum duct, which achieves enhanced heat transfer rates combined with low friction losses, are determined in terms of the aspect ratio and the fin height.
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Dissertations / Theses on the topic "Thermodynamically and hydrodynamically developing flow"

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Kohlmeyer, Berno Werner. "Development of an improved design correlation for local heat transfer coefficients at the inlet regions of annular flow passages." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/61302.

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Several applications, including those in the energy sector that require high thermal efficiency, such as those in the solar energy industry, require a careful thermal analysis of heat exchange components. In this regard, thermal resistance is a major cause of exergy destruction and must be minimised as much as possible, but also adequately designed. In the past, a number of correlations have been developed to predict heat transfer coefficients in compact heat exchangers. The designers of such heat exchangers often exploit the development of thermal boundary layers to achieve higher overall efficiency due to increases in local heat transfer coefficients. However, most of the correlations that have been developed for heat exchangers neglect the specific effect of the thermal boundary layer development in the inlet region, and instead only offer effective average heat transfer coefficients, which most users assume to be constant throughout the heat exchanger. This is often an over-simplification and leads to over-designed heat exchangers. In this study, focus is placed on annular flow passages with uniform heating on the inner wall. This geometry has many applications. This study aims to collect experimental heat transfer data for water at various flow rates and inlet geometries, to process the data and determine local and overall heat transfer coefficients, and to develop an improved local heat transfer coefficient correlation. Experimental tests were performed on a horizontal concentric tube-in-tube heat exchanger with a length of 1.05 m and a diameter ratio of 0.648. The surface of the inner tube was treated with thermochromic liquid crystals (TLCs), which allowed for high-resolution temperature mapping of the heated surface when combined with an automated camera position system in order to determine local heat transfer coefficients. Conventional in-line and out-of-line annular inlet configurations were evaluated for Reynolds numbers from 2 000 to 7 500, as well as the transition from laminar to turbulent flow for a single in-line inlet configuration. It was found that the local heat transfer coefficients were significantly higher at the inlets, and decreased as the boundary layers developed. With the high resolution of the results, the local heat transfer coefficients were investigated in detail. Local maximum and minimum heat transfer coefficients were identified where the thermal boundary layers merged for high turbulent flow cases. The annular inlet geometries only influenced the heat transfer for Reynolds numbers larger than 4 000, for which larger inlets are favoured. Out-of-line inlet geometries are not favoured for heat transfer. A new heat transfer correlation was developed from the experimental data, based on an existing heat transfer correlation for turbulent flow in an annular flow passage, considering the boundary layer development. The new correlation estimated the area-weighted heat transfer coefficients within 10% of the experimental data and closely followed trends for local heat transfer coefficients.
Dissertation (MEng)--University of Pretoria, 2017.
Mechanical and Aeronautical Engineering
MEng
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Conference papers on the topic "Thermodynamically and hydrodynamically developing flow"

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Narayanaswamy, Ramesh, Tilak T. Chandratilleke, and Andrew J. L. Foong. "Thermodynamic Analysis of Heat and Fluid Flow in a Microchannel With Internal Fins." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88107.

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Efficient cooling techniques are one of the critical design requirements for maintaining reliable operational characteristics of modern, miniaturised high performance electronic components. Microchannel heat sinks form an integral part of most devices used for thermal management in electronic equipment cooling. A microchannel of square cross section, having internal longitudinal fins is considered for analysis. A numerical study is carried out to investigate the fluid flow and heat transfer characteristics. Three-dimensional numerical simulations are performed on the microchannel in the presence of a hydrodynamically developed, thermally developing laminar flow. Further on, a thermodynamic analysis is carried out, for a range of fin heights and thermophysical parameters, in order to obtain the irreversibilities due to heat transfer and fluid flow within the microchannel. An optimum fin height, corresponding to the thermodynamically optimum conditions that minimize the entropy generation rates has been obtained. The effect of the presence of internal fins on the entropy generated due to heat transfer, fluid friction, and the total entropy generation is also provided.
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Tenny, J., D. Maynes, and B. W. Webb. "Hydrodynamically Developing Dual-Wall-Driven Microchannel Flow." In ASME 2003 1st International Conference on Microchannels and Minichannels. ASMEDC, 2003. http://dx.doi.org/10.1115/icmm2003-1024.

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The developing flow field in a parallel plate microchannel, induced by wall motion, has been modeled numerically. The flow is driven in this scenario not by an applied pressure gradient, but by the movement of the walls in the axial direction at a constant speed. This type of flow simulates the physical driving mechanism that exists in electro-osmotically generated flow with large channel diameter-to-Debye length ratios. The results are general, however, for any microscale flow induced by wall motion and resulting viscous pumping. The dynamics of the developing flow field were explored for channel length-to-hydraulic diameter ratios (aspect ratio) of 5, 10, and 20 at ten Reynolds numbers, Re (based on the wall velocity), below Re < 2000. The results show that far from the inlet the maximum fluid velocity occurs at the walls, as is expected, and the minimum velocity occurs at the channel center. Near the channel inlet, however, the centerline velocity is not a minimum but reaches a local maximum due to a resulting pressure imbalance generated by the wall motion. The ratio of the centerline velocity to wall velocity depends on the axial distance from the channel inlet, the Reynolds number and the channel aspect ratio. As the aspect ratio increases, the centerline velocity tends to approach the wall velocity far downstream from the inlet. Increases in the Reynolds number have the opposite effect on the centerline velocity. The hydrodynamic developing region, defined by that section of the channel where the wall shear stress is changing, also depends on the channel aspect ratio and Re. In general it is found that the developing region is significantly shorter than for pressure-driven flow at the same Re.
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Thompson, B. R., D. Maynes, and B. W. Webb. "Characterization of the Hydrodynamically Developing Flow in a Microtube Using Molecular Tagging Velocimetry." In ASME 2003 1st International Conference on Microchannels and Minichannels. ASMEDC, 2003. http://dx.doi.org/10.1115/icmm2003-1025.

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There is a need for increased understanding of the momentum transport phenomena in micro-fluidic geometries to aid in the design and optimization of such devices. Micro-molecular tagging velocimetry (μMTV) has been used to characterize the hydrodynamic developing flow in a microtube with an inner diameter of 180 μm. μMTV is a non-intrusive laser-based technique for obtaining detailed measurements of velocity profiles in flows dominated by a single velocity component. μMTV measurements are made by directing an ultra-violet laser beam into a flow containing phosphorescent tracer molecules. The laser beam excites a line of phosphorescence in the flow. Subsequently, two digital images, separated by a short time delay, of the line are captured by a CCD camera. The displacement of the tracer molecules between the images can be determined from the two images and the velocity of the flow is thus calculated. Velocity profile data at ten axial locations within the hydrodynamic developing region of a 180 μm diameter tube were acquired using the μMTV approach. The uncertainty for these measurements ranged from 1.5% to 5.5% of the center line velocity. Data were taken at Reynolds numbers, Re, of 60, 140, 290, and 340. It was observed that a vena-contracta existed in the first few tube diameters for all Re. The velocity profiles obtained very close to the tube entrance exhibited a uniform velocity core flow surrounded by regions of relatively stagnant fluid in the near wall regions. The profiles evolved in the downstream direction until the classical parabolic distribution was observed. The total hydrodynamic entry length agrees well with values published in the literature for macroscale flows, obtained from numerical simulation.
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Everts, Marilize, and Josua Petrus Meyer. "FORCED CONVECTION THERMAL ENTRANCE LENGTH FOR SIMULTANEOUSLY HYDRODYNAMICALLY AND THERMALLY DEVELOPING LAMINAR FLOW AT A CONSTANT HEAT FLUX." In International Heat Transfer Conference 16. Connecticut: Begellhouse, 2018. http://dx.doi.org/10.1615/ihtc16.cov.023020.

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Hwu, Ruey, and Weilin Qu. "Heat Transfer Correlations for Thermally Developing Flow in Rectangular Micro-Channels Subject to Four-Sided and Three-Sided H1 Boundary Conditions." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23173.

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In this study, heat transfer to laminar hydrodynamically fully developed flow in the thermally developing region of rectangular micro-channels is analyzed for four-wall and three-wall circumferentially uniform temperature and axially uniform heat flux (H1) boundary conditions. The temperature and wall heat flux distributions are solved numerically and used to calculate the local average Nusselt number. Based on the numerical results, new correlations capable of predicting heat transfer in the thermally developing region continuously into the fully developed region are developed. The correlations are compared with other correlations and available experimental data, and show good agreement.
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Kondle, Satyanarayana, Jorge L. Alvarado, Charles Marsh, Dave Kessler, and Peter Stynoski. "Laminar Flow Forced Convection Heat Transfer Behavior of a Phase Change Material Fluid in Microchannels." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10787.

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In this paper, a PCM fluid is compared with pure water as heat transfer fluid. The heat transfer behavior of phase change material fluid (PCM) under laminar flow conditions in circular and rectangular microchannels was studied numerically. As part of the numerical study, an effective specific heat technique was used to model the phase change process. Heat transfer results for smooth circular and rectangular microchannels with PCM fluid were obtained under hydrodynamically and thermally fully developed conditions. A PCM fluid in microchannels with different aspect ratios was found to exhibit unique thermal behavior which could be beneficial in electronic cooling applications. As a part of boundary conditions, the flow was assumed to be hydrodynamically fully developed at the inlet and thermally developing inside the microchannel. Heat transfer characteristics of PCM slurry flow in microchannels of various aspect ratios have been studied under three types of wall boundary conditions including constant axial heat flux with constant peripheral temperature (H1), constant heat flux with variable peripheral temperature (H2), and constant wall temperature (T) boundary condition. Effects of phase change on the heat transfer were determined using a specific heat model, which includes the effect of latent heat of fusion of the phase change material. The fully developed Nusselt number was found to be higher for H1 than for H2 and T boundary conditions for all the geometries.
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Sadeghi, Arman, Mostafa Baghani, and Mohammad Hassan Saidi. "Entropy Generation in Thermally Developing Laminar Forced Convection Through a Slit Microchannel." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-31070.

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The issue of entropy generation in laminar forced convection of a Newtonian fluid through a slit microchannel is analytically investigated by taking the viscous dissipation effect, the slip velocity and the temperature jump at the wall into account. Flow is considered to be hydrodynamically fully developed but thermally developing. The energy equation is solved by means of integral transform. The results demonstrate that to increase Knudsen number is to decrease entropy generation, while the effect of increasing values of Brinkman number and the group parameter is to increase entropy generation. Also it is disclosed that in the thermal entrance region the average entropy generation number over the cross section of channel is an increasing function of axial coordinate.
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Duan, Zhipeng, and Y. S. Muzychka. "Models for Gaseous Slip Flow in Non-Circular Microchannels." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32191.

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Micro-scale fluid dynamics has received intensive interest due to the emergence of Micro-Electro-Mechanical Systems (MEMS) technology. Non-circular cross sections are common channel shapes that can be produced through a variety of micro-fabrication techniques. Non-circular microchannels have extensive practical applications in MEMS. Slip flow in noncircular microchannels has been examined by the authors and a review of several new models obtained by the authors is presented. These models are general and robust, and can be used by the research community for practical engineering design of microchannel flow systems. The reviewed models address: (i) fully developed slip flow in non-circular microchannels, (ii) hydrodynamically developing slip flow in non-circular microchannels, (iii) compressibility effects, and (iv) roughness effects. A model is proposed to predict the friction factor and Reynolds product fRe for fully developed and developing slip flow in most non-circular micro-channels. Compressibility effects on slip flow in non-circular microchannels have been examined and simple models are proposed to predict the pressure distribution and mass flow rate for slip flow in most non-circular microchannels. Finally, the effect of corrugated surface roughness on fully developed laminar flow in microtubes is examined. Simple analytical models are developed to predict friction factor and pressure drop in corrugated rough microtubes for continuum flow and slip flow.
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van Rij, Jennifer, Todd Harman, and Tim Ameel. "The Effect of Creep Flow on Two-Dimensional Isoflux Microchannels." In ASME 4th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2006. http://dx.doi.org/10.1115/icnmm2006-96150.

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Micro channel convective heat transfer and friction loss characteristics are numerically evaluated for gaseous, two-dimensional, steady state, laminar, constant wall heat flux flows. The effects of Knudsen number, accommodation coefficients, second order slip boundary conditions, creep flow, and thermal/hydrodynamic developing flow are considered. These effects are compared through the Poisuelle number and Nusselt number. Numerical values for the Poisuelle and Nusselt numbers are obtained using a continuum based three-dimensional, unsteady, compressible computational fluid dynamics algorithm that has been modified with slip boundary conditions. To verify the numerical results, analytic solutions for the hydrodynamically and thermally fully developed Poisuelle and Nusselt numbers have been derived. The fully developed analytic Poisuelle and Nusselt numbers are given as a function of Knudsen number, the first and second order velocity slip and temperature jump coefficients, the Brinkman number, and the ratio of the thermal creep velocity to the mean velocity. Excellent agreement between the numerical and analytical data is demonstrated. Second order slip terms and creep velocity are shown to have significant effects on the Poisuelle and Nusselt numbers.
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Galvis, E., and J. R. Culham. "Lower Entropy Generation in Microchannels With Laminar Single Phase Flow." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30031.

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In this study the entropy generation minimization method is used to find the optimum channel dimensions in micro heat exchangers with a uniform heat flux. With this approach, pressure drop and heat transfer in the micro channels are considered simultaneously during the optimization analysis. A computational model is developed to find the optimum channel depth knowing other channel geometry dimensions and coolant inlet properties. The flow is assumed laminar and both hydrodynamically and thermally fully developed and incompressible. However, to take into account the effect of the developing length in the friction losses, the Hagenbach’s factor is introduced. The micro channels are assumed to have an isothermal or isoflux boundary condition, non-slip flow, and fluid properties have dependency on temperature accordingly. For these particular case studies, the pressure drop and heat transfer coefficient for the isoflux boundary condition is higher than the isothermal case. Higher heat transfer coefficient and pressure drop were found when the channel size decreased. The optimum channel geometry that minimizes the entropy generation rate tends to be a deep, narrow channel.
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