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Artykuły w czasopismach na temat „Heat Fluid mechanics”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 1 lutego 2022

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1

I., E., Dale A. Anderson, John C. Tannehill i Richard H. Pletcher. "Computational Fluid Mechanics and Heat Transfer." Mathematics of Computation 46, nr 174 (kwiecień 1986): 764. http://dx.doi.org/10.2307/2008017.

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2

Schmidt, Frank W. "Computational fluid mechanics and heat transfer". International Journal of Heat and Fluid Flow 7, nr 3 (wrzesień 1986): 239. http://dx.doi.org/10.1016/0142-727x(86)90028-7.

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Schmidt, Frank W. "Computational fluid mechanics and heat transfer". International Journal of Heat and Fluid Flow 7, nr 1 (marzec 1986): 27. http://dx.doi.org/10.1016/0142-727x(86)90038-x.

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Zamora, Blas, Antonio S. Kaiser i Pedro G. Vicente. "Improvement in Learning on Fluid Mechanics and Heat Transfer Courses Using Computational Fluid Dynamics". International Journal of Mechanical Engineering Education 38, nr 2 (kwiecień 2010): 147–66. http://dx.doi.org/10.7227/ijmee.38.2.6.

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This paper is concerned with the teaching of fluid mechanics and heat transfer on courses for the industrial engineer degree at the Polytechnic University of Cartagena (Spain). In order to improve the engineering education, a pedagogical method that involves project-based learning, using computational fluid dynamics (CFD), was applied. The project-based learning works well for mechanical engineering education, since it prepares students for their later professional training. The courses combined applied and advanced concepts of fluid mechanics with the basic numerical aspects of CFD, including validation of the results obtained. In this approach, the physical understanding of practical problems of fluid mechanics and heat transfer played an important role. Satisfactory numerical results were obtained by using both Phoenics and Fluent finite-volume codes. Some cases were solved using the well known Matlab software. Comparisons were made between the results obtained by analytical solutions (if any) with those reached by CFD general-purpose codes and with those obtained by Matlab. This system provides engineering students with a solid comprehension of several aspects of thermal and fluids engineering.

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5

Ngo, C. C., M. J. Voon i F. C. Lai. "Online heat transfer and fluid mechanics laboratory". Computer Applications in Engineering Education 13, nr 1 (2005): 1–9. http://dx.doi.org/10.1002/cae.20025.

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Meyer, Josua P. "Heat Transfer, Fluid Mechanics and Thermodynamics—HEFAT2011". Heat Transfer Engineering 34, nr 14 (14.11.2013): 1141–46. http://dx.doi.org/10.1080/01457632.2013.776444.

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7

Pal, Rajinder. "Teaching Fluid Mechanics and Thermodynamics Simultaneously through Pipeline Flow Experiments". Fluids 4, nr 2 (1.06.2019): 103. http://dx.doi.org/10.3390/fluids4020103.

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Entropy and entropy generation are abstract and illusive concepts for undergraduate students. In general, students find it difficult to visualize entropy generation in real (irreversible) processes, especially at a mechanistic level. Fluid mechanics laboratory can assist students in making the concepts of entropy and entropy generation more tangible. In flow of real fluids, dissipation of mechanical energy takes place due to friction in fluids. The dissipation of mechanical energy in pipeline flow is reflected in loss of pressure of fluid. The degradation of high quality mechanical energy into low quality frictional heat (internal energy) is simultaneously reflected in the generation of entropy. Thus, experiments involving measurements of pressure gradient as a function of flow rate in pipes offer an opportunity for students to visualize and quantify entropy generation in real processes. In this article, the background in fluid mechanics and thermodynamics relevant to the concepts of mechanical energy dissipation, entropy and entropy generation are reviewed briefly. The link between entropy generation and mechanical energy dissipation in pipe flow experiments is demonstrated both theoretically and experimentally. The rate of entropy generation in pipeline flow of Newtonian fluids is quantified through measurements of pressure gradient as a function of flow rate for a number of test fluids. The factors affecting the rate of entropy generation in pipeline flows are discussed.

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8

Molerus, Otto. "Fluid Mechanics and Heat Transfer in Fluidized Beds". KONA Powder and Particle Journal 18 (2000): 121–30. http://dx.doi.org/10.14356/kona.2000018.

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9

Reisel, John R. "Experimental heat transfer, fluid mechanics and thermodynamics 1993". Experimental Thermal and Fluid Science 11, nr 4 (listopad 1995): 414. http://dx.doi.org/10.1016/0894-1777(95)90004-7.

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Granados-Ortiz, Francisco-Javier, i Joaquín Ortega-Casanova. "Mechanical Characterisation and Analysis of a Passive Micro Heat Exchanger". Micromachines 11, nr 7 (9.07.2020): 668. http://dx.doi.org/10.3390/mi11070668.

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Heat exchangers are widely used in many mechanical, electronic, and bioengineering applications at macro and microscale. Among these, the use of heat exchangers consisting of a single fluid passing through a set of geometries at different temperatures and two flows in T-shape channels have been extensively studied. However, the application of heat exchangers for thermal mixing over a geometry leading to vortex shedding has not been investigated. This numerical work aims to analyse and characterise a heat exchanger for microscale application, which consists of two laminar fluids at different temperature that impinge orthogonally onto a rectangular structure and generate vortex shedding mechanics that enhance thermal mixing. This work is novel in various aspects. This is the first work of its kind on heat transfer between two fluids (same fluid, different temperature) enhanced by vortex shedding mechanics. Additionally, this research fully characterise the underlying vortex mechanics by accounting all geometry and flow regime parameters (longitudinal aspect ratio, blockage ratio and Reynolds number), opposite to the existing works in the literature, which usually vary and analyse blockage ratio or longitudinal aspect ratio only. A relevant advantage of this heat exchanger is that represents a low-Reynolds passive device, not requiring additional energy nor moving elements to enhance thermal mixing. This allows its use especially at microscale, for instance in biomedical/biomechanical and microelectronic applications.

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11

Hargrove, Jeffrey B., John R. Lloyd i Clark J. Radcliffe. "Radiative Heat Transfer Properties of Electro-Controllable Fluids". Journal of Heat Transfer 125, nr 6 (19.11.2003): 1058–64. http://dx.doi.org/10.1115/1.1621894.

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Active control of radiation heat transfer in liquids can be accomplished with the use of a class of fluids referred to here as electro-controllable (EC) fluids. EC fluids in general consist of a colloidal suspension of polarizable, micron-size particles dispersed in a carrier fluid with an appropriate dielectric constant. When an electric field is applied, the particles redistribute in the fluid, changing from a uniformly dispersed configuration to a tightly organized chain formation that follows the lines of the electric field, thus causing a change in the thermal radiation transport. In an example application, experiments are conducted and models are developed for thermal radiation transmittance through a composite window featuring a central layer of EC fluid. The specific EC fluids of this study are made of micron-sized Zeolite particles suspended in a light Silicone oil carrier fluid of appropriate dielectric strength. The incident thermal radiation ranged in wavelength between 500 nm and 800 nm, and the strength of the applied electric field ranged from 100 V/mm to 500 V/mm. The models are applicable for both the dispersed organizational state and the field induced chained state. Absorption was demonstrated to be the fundamental radiation transport property enabling the control process. The EC fluid transmittance predicted by these models are compared to the data obtained by experimental measurement demonstrate very good agreement.

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12

K.H., Jyothiprakash, Krishnegowda Y.T., Krishna Venkataram i K. N. Seetharamu. "Effect of ambient heat-in-leak on the performance of three-fluid cross-flow heat exchanger". International Journal of Numerical Methods for Heat & Fluid Flow 28, nr 9 (3.09.2018): 2012–35. http://dx.doi.org/10.1108/hff-05-2017-0205.

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Purpose Heat exchangers working in cryogenic temperature ranges are strongly affected by heat ingression from the ambient. This paper aims to investigate the effect of ambient heat-in-leak on the performance of a three-fluid cross-flow cryogenic heat exchanger. Design/methodology/approach The governing equations are derived for a three-fluid cross-flow cryogenic heat exchanger based on the conservation of energy principle. For given fluid inlet temperatures, the governing equations are solved using the finite element method to obtain exit temperatures of the three-fluid exchanger. The performance of the heat exchanger is determined using effectiveness-number of transfer units (e-NTU) method. In the present analysis, the amount of ambient heat-in-leak to the heat exchanger is accounted by two parameters Ht and Hb. The variation of the heat exchanger effectiveness due to ambient heat-in-leak is analyzed for various non-dimensional parameters defined to study the heat exchanger performance. Findings The effect of ambient heat in leak to the heat exchanger from the surrounding is to increase the dimensionless exit mean temperature of all three fluids. An increase in heat in leak parameter (Ht = Hb) value from 0 to 0.1 reduces hot fluid effectiveness by 32 per cent for an NTU value of 10. Originality Value The effect of heat-in-leak on a three-fluid cross-flow cryogenic heat exchanger is significant, but so far, no investigations are carried out. The results establish the efficacy of the method and throw light on important considerations involved in the design of such heat exchangers.

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13

Tian, Zhe, Ali Abdollahi, Mahmoud Shariati, Atefeh Amindoust, Hossein Arasteh, Arash Karimipour, Marjan Goodarzi i Quang-Vu Bach. "Turbulent flows in a spiral double-pipe heat exchanger". International Journal of Numerical Methods for Heat & Fluid Flow 30, nr 1 (18.09.2019): 39–53. http://dx.doi.org/10.1108/hff-04-2019-0287.

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Purpose This paper aims to study the fluid flow and heat transfer through a spiral double-pipe heat exchanger. Nowadays using spiral double-pipe heat exchangers has become popular in different industrial segments due to its complex and spiral structure, which causes an enhancement in heat transfer. Design/methodology/approach In these heat exchangers, by converting the fluid motion to the secondary motion, the heat transfer coefficient is greater than that of the straight double-pipe heat exchangers and cause increased heat transfer between fluids. Findings The present study, by using the Fluent software and nanofluid heat transfer simulation in a spiral double-tube heat exchanger, investigates the effects of operating parameters including fluid inlet velocity, volume fraction of nanoparticles, type of nanoparticles and fluid inlet temperature on heat transfer efficiency. Originality/value After presenting the results derived from the fluid numerical simulation and finding the optimal performance conditions using a genetic algorithm, it was found that water–Al2O3 and water–SiO2 nanofluids are the best choices for the Reynolds numbers ranging from 10,551 to 17,220 and 17,220 to 31,910, respectively.

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14

Sparrow, E. M., L. F. A. Azevedo i A. T. Prata. "Two-Fluid and Single-Fluid Natural Convection Heat Transfer in an Enclosure". Journal of Heat Transfer 108, nr 4 (1.11.1986): 848–52. http://dx.doi.org/10.1115/1.3247022.

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Natural convection experiments were performed for an enclosure of square cross section containing either a single fluid or two immiscible fluids in a layered configuration. The two vertical walls of the cross section were respectively heated and cooled, while the two horizontal walls were adiabatic. The single-fluid experiments, performed with distilled water and with n-hexadecane paraffin (Pr = 5 and 39.2, respectively), yielded Nusselt numbers whose Rayleigh and Prandtl number dependences were perfectly correlated by a single dimensionless group. These single-fluid results were used as baseline information for the development of methods to predict the heat transfer in two-fluid layered systems. To test the utility of the predictive methods, experiments were carried out for water–hexadecane systems in which the position of the interface separating the liquids was varied parametrically. It was found that the experimentally determined, two-layer Nusselt numbers were in excellent agreement with the predicted values. The prediction methods are not limited to the particular fluids employed here, nor do they require additional experimental data for their application.

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15

Sheremet, Mikhail A., i Ioan Pop. "Natural convection combined with thermal radiation in a square cavity filled with a viscoelastic fluid". International Journal of Numerical Methods for Heat & Fluid Flow 28, nr 3 (5.03.2018): 624–40. http://dx.doi.org/10.1108/hff-02-2017-0059.

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Purpose The purpose of this paper is to study natural convective heat transfer and viscoelastic fluid flow in a differentially heated square cavity under the effect of thermal radiation. Design/methodology/approach The cavity filled with a viscoelastic fluid is heated uniformly from the left wall and cooled from the right side while insulated from horizontal walls. Governing partial differential equations formulated in non-dimensional stream function, vorticity and temperature with corresponding boundary conditions have been solved by finite difference method of second order accuracy. The effects of Rayleigh number (Ra = 1e+3−1e+5), radiation parameter (Rd = 0 − 10), Prandtl number (Pr = 1 − 30) and elastic number (E = 0.0001 − 0.001) on flow patterns, temperature fields, average Nusselt number at hot vertical wall and rate of fluid flow have been studied. Findings It has been found that a growth of elastic number leads to the heat transfer reduction and convective flow attenuation. The heat conduction is a dominating heat transfer mechanism for high values of radiation parameter. Originality/value The originality of this work is to analyze heat transfer and fluid flow of a viscoelastic fluid inside a differentially heated cavity. The results would benefit scientists and engineers to become familiar with the flow and heat behavior of non-Newtonian fluids, and the way to predict the properties of this flow for possibility of using viscoelastic fluids in compact heat exchangers, electronic cooling systems, polymer engineering, etc.

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16

MEHMOOD, OBAID ULLAH, NORZIEHA MUSTAPHA, SHARIDAN SHAFIE i CONSTANTIN FETECAU. "SIMULTANEOUS EFFECTS OF DISSIPATIVE HEATING AND PARTIAL SLIP ON PERISTALTIC TRANSPORT OF SISKO FLUID IN ASYMMETRIC CHANNEL". International Journal of Applied Mechanics 06, nr 01 (luty 2014): 1450008. http://dx.doi.org/10.1142/s1758825114500082.

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This paper looks at the dissipative heat transfer on the peristaltic flow of a Sisko fluid in an asymmetric channel. Flow exhibits slip at the channel walls maintained at nonuniform temperatures. Long wavelength approximation is utilized and perturbation solutions are obtained about Sisko fluid parameter. Closed form solutions for the stream function, axial pressure gradient, axial velocity, temperature and the heat transfer coefficient are presented. Influences of various interesting parameters are presented in graphical and tabular forms. Pumping and trapping phenomena are discussed for increasing velocity slip parameter. A comparative study on temperature and heat transfer coefficient for viscous, shear thinning and shear thickening fluids has been presented. Comparisons for viscous fluid are found in good agreement.

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17

Wisniak, Jaime. "William John Macquorn Rankine. Thermodynamics, heat conversion, and fluid mechanics". Educación Química 18, nr 3 (22.08.2018): 238. http://dx.doi.org/10.22201/fq.18708404e.2007.3.65955.

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<span>William John Macquorn Rankine (1820-1870) fue un científico, educador e ingeniero muy prolífico y multifuncional, un pionero en el esfuerzo de llevar los recursos de las matemáticas y la física a los problemas prácticos de la ciencia y la ingeniería. Sus contribuciones abarcan un amplio intervalo de actividades: termodinámica, conversión del calor, mecánica de fluidos, construcción de barcos, mecánica de los sólidos y de los suelos, así como temas filosóficos. Él es particularmente famoso por sus contribuciones a la termodinámica, al entendimiento de las máquinas térmicas y al desarrollo de la segunda ley. Entre sus contribuciones en esta área tenemos la escala Rankine de temperaturas y el ciclo de vapor Rankine para la conversión de calor en trabajo. Fue el primero que definió tensión y esfuerzo rigurosamente.</span>

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Meyer, Josua P. "Heat Transfer, Fluid Mechanics, and Thermodynamics in Our Environment—HEFAT2012". Heat Transfer Engineering 35, nr 16-17 (4.04.2014): 1389–93. http://dx.doi.org/10.1080/01457632.2014.888918.

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Meyer, Josua P. "10th International Heat Transfer, Fluid Mechanics and Thermodynamics Conference—HEFAT2014". Heat Transfer Engineering 37, nr 17 (4.05.2016): 1443–44. http://dx.doi.org/10.1080/01457632.2016.1142310.

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Mwesigye, Aggrey, i Josua P. Meyer. "12th International Heat Transfer, Fluid Mechanics and Thermodynamics Conference – HEFAT2016". Heat Transfer Engineering 40, nr 13-14 (10.04.2018): 1073–74. http://dx.doi.org/10.1080/01457632.2018.1457205.

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21

Tashtoush, B., i E. Abu-Irshaid. "Heat and fluid flow from a wavy surface subjected to a variable heat flux". Acta Mechanica 152, nr 1-4 (marzec 2001): 1–8. http://dx.doi.org/10.1007/bf01176941.

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Mishra, Manish, P. K. Das i Sunil Sarangi. "Transient Behavior of Crossflow Heat Exchangers With Longitudinal Conduction and Axial Dispersion". Journal of Heat Transfer 126, nr 3 (1.06.2004): 425–33. http://dx.doi.org/10.1115/1.1738422.

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Transient temperature response of the crossflow heat exchangers with finite wall capacitance and both fluids unmixed is investigated numerically for step, ramp and exponential perturbations provided in hot fluid inlet temperature. Effect of two-dimensional longitudinal conduction in separating sheet and axial dispersion in fluids on the transient response has been investigated. Conductive heat transport due to presence of axial dispersion in fluids have been analyzed in detail and shown that presence of axial dispersion in both of the fluid streams neutralizes the total conductive heat transport during the energy balance. It has also been shown that the presence of axial dispersion of high order reduces the effect of longitudinal conduction.

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23

Ames, K. A., i B. Straughan. "Penetrative convection in fluid layers with internal heat sources". Acta Mechanica 85, nr 3-4 (wrzesień 1990): 137–48. http://dx.doi.org/10.1007/bf01181513.

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Haider, Sajjad, Adnan Saeed Butt, Imran Syed Muhammad, Asif Ali, Yun-Zhang Li, Syed Muhammad Ali Naqvi i Muhammad Adnan Qaiser. "Impact of nano-particles shapes on Al2O3-water nano-fluid flow due to a stretching cylinder". International Journal of Numerical Methods for Heat & Fluid Flow 30, nr 5 (19.08.2019): 2809–32. http://dx.doi.org/10.1108/hff-02-2019-0113.

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Purpose The purpose of this study is to theoretically probe the shape impacts of nano-particle on boundary layer flow of nano-fluid toward a stretching cylinder with heat-transmission effects. The base fluid used for this study is pure water, and aluminum oxide nano-particles are suspended in it. Four different shapes of nano-particle, namely, cylindrical, brick, platelets and blades, are considered to carry out the study. Design/methodology/approach The problem is modelled mathematically and the nonlinear system of equations is attained by using appropriate transmutations. The solution of transmuted equations is achieved by utilizing a shooting technique with Fourth-Fifth order Runge–Kutta Fehlberg scheme. Numerically attained results are elucidated through graphs and tables which are further compared under limiting cases with existing literature to check the validity of the results. Findings It is observed that fluid velocity and temperature of cylindrical shaped water nano-fluids are more than the nano-fluid having brick-shaped nano-particles. Moreover, it is seen that the nano-fluids suspended with platelets-shaped nano-particles have higher velocity and temperature than the nano-fluids containing blade-shaped nano-particles. The curvature parameter and nano-particles volume fraction have increasing effects on flow velocity and temperature of nano-fluids containing all types of nano-particle shapes. Originality/value Numerous authors have examined the impacts of nano-particle shapes on characteristics of heat transfer and fluid flow. However, to the best of the authors’ knowledge, the shape impacts of nano-particles on boundary layer flow of nano-fluid toward a stretching cylinder with heat-transmission effects have not been discussed. So, to fulfill this gap, the present paper explicates the impacts of various nano-particle shapes on Al2O3–water-based nano-fluid flow past a stretching cylinder with heat-transfer effects.

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25

Sekulic´, D. P., i I. Kmec´ko. "Three-Fluid Heat Exchanger Effectiveness—Revisited". Journal of Heat Transfer 117, nr 1 (1.02.1995): 226–29. http://dx.doi.org/10.1115/1.2822309.

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Arya, H., M. M. Sarafraz i M. Arjomandi. "Heat transfer and fluid flow of MgO/ethylene glycol in a corrugated heat exchanger". Journal of Mechanical Science and Technology 32, nr 8 (sierpień 2018): 3975–82. http://dx.doi.org/10.1007/s12206-018-0748-x.

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Spiga, M., i G. Spiga. "Transient Temperature Fields in Crossflow Heat Exchangers With Finite Wall Capacitance". Journal of Heat Transfer 110, nr 1 (1.02.1988): 49–53. http://dx.doi.org/10.1115/1.3250471.

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Solutions are provided in nondimensional form for the transient analysis of direct-transfer crossflow heat exchangers, with both fluids unmixed and finite wall heat capacity. The two-dimensional transient temperature distributions of core wall and both fluids are determined by analytical methods for any externally applied variation of the primary fluid inlet temperature. The general solutions are derived by the local energy balance equations, and are presented as simple integrals of the Green’s functions, which represent the pulse response following a deltalike perturbation in the inlet temperature of the primary fluid, and are deduced using the Laplace transform method. The Green’s functions are expressed as integrals of modified Bessel functions, in terms of the heat capacity ratios, number of transfer units, heat transfer resistance and flow capacitance ratios.

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ZHANG, JIN, STEPHEN J. WATSON i HARRIS WONG. "Fluid flow and heat transfer in a dual-wet micro heat pipe". Journal of Fluid Mechanics 589 (8.10.2007): 1–31. http://dx.doi.org/10.1017/s0022112007007823.

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Micro heat pipes have been used to cool micro electronic devices, but their heat transfer coefficients are low compared with those of conventional heat pipes. In this work, a dual-wet pipe is proposed as a model to study heat transfer in micro heat pipes. The dual-wet pipe has a long and narrow cavity of rectangular cross-section. The bottom-half of the horizontal pipe is made of a wetting material, and the top-half of a non-wetting material. A wetting liquid fills the bottom half of the cavity, while its vapour fills the rest. This configuration ensures that the liquid–vapour interface is pinned at the contact line. As one end of the pipe is heated, the liquid evaporates and increases the vapour pressure. The higher pressure drives the vapour to the cold end where the vapour condenses and releases the latent heat. The condensate moves along the bottom half of the pipe back to the hot end to complete the cycle. We solve the steady-flow problem assuming a small imposed temperature difference between the two ends of the pipe. This leads to skew-symmetric fluid flow and temperature distribution along the pipe so that we only need to focus on the evaporative half of the pipe. Since the pipe is slender, the axial flow gradients are much smaller than the cross-stream gradients. Thus, we can treat the evaporative flow in a cross-sectional plane as two-dimensional. This evaporative motion is governed by two dimensionless parameters: an evaporation number E defined as the ratio of the evaporative heat flux at the interface to the conductive heat flux in the liquid, and a Marangoni number M. The motion is solved in the limit E→∞ and M→∞. It is found that evaporation occurs mainly near the contact line in a small region of size E−1W, where W is the half-width of the pipe. The non-dimensional evaporation rate Q* ~ E−1 ln E as determined by matched asymptotic expansions. We use this result to derive analytical solutions for the temperature distribution Tp and vapour and liquid flows along the pipe. The solutions depend on three dimensionless parameters: the heat-pipe number H, which is the ratio of heat transfer by vapour flow to that by conduction in the pipe wall and liquid, the ratio R of viscous resistance of vapour flow to interfacial evaporation resistance, and the aspect ratio S. If HR≫1, a thermal boundary layer appears near the pipe end, the width of which scales as (HR)−1/2L, where L is the half-length of the pipe. A similar boundary layer exists at the cold end. Outside the boundary layers, Tp varies linearly with a gradual slope. Thus, these regions correspond to the evaporative, adiabatic and condensing regions commonly observed in conventional heat pipes. This is the first time that the distinct regions have been captured by a single solution, without prior assumptions of their existence. If HR ~ 1 or less, then Tp is linear almost everywhere. This is the case found in most micro-heat-pipe experiments. Our analysis of the dual-wet pipe provides an explanation for the comparatively low effective thermal conductivity in micro heat pipes, and points to ways of improving their heat transfer capabilities.

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Durairaj, Mythili, Sivaraj Ramachandran i Rashidi Mohammad Mehdi. "Heat generating/absorbing and chemically reacting Casson fluid flow over a vertical cone and flat plate saturated with non-Darcy porous medium". International Journal of Numerical Methods for Heat & Fluid Flow 27, nr 1 (3.01.2017): 156–73. http://dx.doi.org/10.1108/hff-08-2015-0318.

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Purpose The present investigation aims to deal with the study of unsteady, heat-generating/-absorbing and chemically reacting Casson fluid flow over a vertical cone and flat plate saturated with non-Darcy porous medium in the presence of cross-diffusion effects. Design/methodology/approach A numerical computation for the governing equations has been performed using implicit finite difference method of Crank–Nicolson type. Findings The influence of various physical parameters on velocity, temperature and concentration distributions is illustrated graphically, and the physical aspects are discussed in detail. Numerical results for average skin-friction, Nusselt number and Sherwood number are tabulated for the pertaining physical parameters. Results indicate that Soret and Dufour effects have notable influence on heat and mass transfer characteristics of the fluid when the temperature and concentration gradients are high. It is also observed that the consideration of heat generation/absorption plays a vital role in predicting the heat transfer characteristics of moving fluids. Research limitations/implications Consider a two-dimensional, unsteady, free convective flow of an incompressible Casson fluid over a vertical cone and a flat plate saturated with non-Darcy porous medium. The fluid properties are assumed to be constant except for density variations in the buoyancy force term. The fluid flow is moderate and the permeability of the medium is assumed to be low, so that the Forchheimer flow model is applicable. Practical implications The flow of Casson fluids (such as drilling muds, clay coatings and other suspensions, certain oils and greases, polymer melts and many emulsions), in the presence of heat transfer, is an important research area because of its relevance in the optimized processing of chocolate, toffee and other foodstuffs. Social implications In the heat and mass transfer investigations, the Casson fluid model is found to be accurately applicable in many practical situations in the wings of polymer processing industries and biomechanics, etc.; some prominent examples are silicon suspensions, suspensions of bentonite in water and lithographic varnishes used for printing inks. Originality/value The motivation of the present study is to bring out the effects of heat source/sink, Soret and Dufour effects on chemically reacting Casson fluid flow over a vertical cone and flat plate saturated with non-Darcy porous medium. The flow of Casson fluids (such as certain oils and greases, polymer melts and many emulsions) in the presence of heat transfer is an important research area because of its relevance in the optimized processing of chocolate, toffee and other foodstuffs. A numerical computation for the governing equations has been performed using implicit finite difference method of the Crank–Nicolson type.

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30

Sandeep, N., i I. L. Animasaun. "Theoretical Exploration of Exponential Heat Source and Thermal Stratification Effects on The Motion of 3-Dimensional Flow of Casson Fluid Over a Low Heat Energy Surface at Initial Unsteady Stage". Journal of Theoretical and Applied Mechanics 47, nr 2 (27.06.2017): 61–82. http://dx.doi.org/10.1515/jtam-2017-0010.

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AbstractWithin the last few decades, experts and scientists dealing with the flow of non-Newtonian fluids (most especially Casson fluid) have confirmed the existence of such flow on a stretchable surface with low heat energy (i.e. absolute zero of temperature). This article presents the motion of a three-dimensional of such fluid. Influence of uniform space dependent internal heat source on the intermolecular forces holding the molecules of Casson fluid is investigated. It is assumed that the stagnation flow was induced by an external force (pressure gradient) together with impulsive. Based on these assumptions, variable thermophysical properties are most suitable; hence modified kinematic viscosity model is presented. The system of governing equations of 3-dimensional unsteady Casson fluid was non-dimensionalized using suitable similarity transformation which unravels the behavior of the flow at full fledge short period. The numerical solution of the corresponding boundary value problem (ODE) was obtained using Runge-Kutta fourth order along with shooting technique. The intermolecular forces holding the molecules of Casson fluid flow in both horizontal directions when magnitude of velocity ratio parameters are greater than unity breaks continuously with an increase in Casson parameter and this leads to an increase in velocity profiles in both directions.

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31

Gorla, R. S. R. "Heat transfer from continuous moving fibers in a micropolar fluid". Acta Mechanica 59, nr 1-2 (maj 1986): 123–31. http://dx.doi.org/10.1007/bf01177065.

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32

Ghosh, A. K., i L. Debnath. "On heat transfer to pulsatile flow of a viscoelastic fluid". Acta Mechanica 93, nr 1-4 (marzec 1992): 169–77. http://dx.doi.org/10.1007/bf01182582.

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Mcleod, Paul, David S. Riley i R. Stephen J. Sparks. "Melting of a sphere in hot fluid". Journal of Fluid Mechanics 327 (25.11.1996): 393–409. http://dx.doi.org/10.1017/s0022112096008592.

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Solid bodies immersed in hot fluids may melt. The molten material produced can then mix with, and be assimilated into, the fluid influencing its compositional and thermal states. Compositional convection of melt and thermal convection of cooled fluid around the solid determine the heat flux from the fluid to the solid's surface. This, together with the thermal properties of the solid, controls the rate of melting. Experiments on melting wax spheres into water are described; these have shown how variations in the nature of melt flow round the sphere cause differing melting rates and hence the development of a distinctive melting morphology. Melting rates are calculated by a simple theoretical analysis which estimates melt layer thickness and the heat flux from the fluid. Melting rate predictions agree well with the experimental data. A geological application occurs when magma incorporates blocks of its surrounding wall rock. Relatively rapid melting rates are estimated, typically in the order of a half metre per day. Such fast rates indicate that this method of contamination may be an important influence on magmatic evolution in continental environments.

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34

Gad-el-Hak, Mohamed. "The Fluid Mechanics of Microdevices—The Freeman Scholar Lecture". Journal of Fluids Engineering 121, nr 1 (1.03.1999): 5–33. http://dx.doi.org/10.1115/1.2822013.

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Manufacturing processes that can create extremely small machines have been developed in recent years. Microelectromechanical systems (MEMS) refer to devices that have characteristic length of less than 1 mm but more than 1 micron, that combine electrical and mechanical components and that are fabricated using integrated circuit batch-processing techniques. Electrostatic, magnetic, pneumatic and thermal actuators, motors, valves, gears, and tweezers of less than 100-μm size have been fabricated. These have been used as sensors for pressure, temperature, mass flow, velocity and sound, as actuators for linear and angular motions, and as simple components for complex systems such as micro-heat-engines and micro-heat-pumps. The technology is progressing at a rate that far exceeds that of our understanding of the unconventional physics involved in the operation as well as the manufacturing of those minute devices. The primary objective of this article is to critically review the status of our understanding of fluid flow phenomena particular to microdevices. In terms of applications, the paper emphasizes the use of MEMS as sensors and actuators for flow diagnosis and control.

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35

Feppon, F., G. Allaire, C. Dapogny i P. Jolivet. "Body-fitted topology optimization of 2D and 3D fluid-to-fluid heat exchangers". Computer Methods in Applied Mechanics and Engineering 376 (kwiecień 2021): 113638. http://dx.doi.org/10.1016/j.cma.2020.113638.

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36

Limare, Angela, Claude Jaupart, Edouard Kaminski, Loic Fourel i Cinzia G. Farnetani. "Convection in an internally heated stratified heterogeneous reservoir". Journal of Fluid Mechanics 870 (7.05.2019): 67–105. http://dx.doi.org/10.1017/jfm.2019.243.

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The Earth’s mantle is chemically heterogeneous and probably includes primordial material that has not been affected by melting and attendant depletion of heat-producing radioactive elements. One consequence is that mantle internal heat sources are not distributed uniformly. Convection induces mixing, such that the flow pattern, the heat source distribution and the thermal structure are continuously evolving. These phenomena are studied in the laboratory using a novel microwave-based experimental set-up for convection in internally heated systems. We follow the development of convection and mixing in an initially stratified fluid made of two layers with different physical properties and heat source concentrations lying above an adiabatic base. For relevance to the Earth’s mantle, the upper layer is thicker and depleted in heat sources compared to the lower one. The thermal structure tends towards that of a homogeneous fluid with a well-defined time constant that scales with $Ra_{H}^{-1/4}$, where $Ra_{H}$ is the Rayleigh–Roberts number for the homogenized fluid. We identified two convection regimes. In the dome regime, large domes of lower fluid protrude into the upper layer and remain stable for long time intervals. In the stratified regime, cusp-like upwellings develop at the edges of large basins in the lower layer. Due to mixing, the volume of lower fluid decreases to zero over a finite time. Empirical scaling laws for the duration of mixing and for the peak temperature difference between the two fluids are derived and allow extrapolation to planetary mantles.

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37

Meyer, Josua P. "PREFACE: INTERNATIONAL CONFERENCE ON HEAT TRANSFER, FLUID MECHANICS AND THERMODYNAMICS, 2014". Computational Thermal Sciences: An International Journal 7, nr 2 (2015): vi. http://dx.doi.org/10.1615/computthermalscien.2015013884.

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38

Wang, T., T. W. Simon i J. Buddhavarapu. "Heat Transfer and Fluid Mechanics Measurements in Transitional Boundary Layer Flows". Journal of Engineering for Gas Turbines and Power 107, nr 4 (1.10.1985): 1007–15. http://dx.doi.org/10.1115/1.3239804.

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Experimental results are presented to document hydrodynamic and thermal development of flat-plate boundary layers undergoing natural transition. Local heat transfer coefficients, skin friction coefficients, and profiles of velocity, temperature, and Reynolds normal and shear stresses are presented. A case with no transition and transitional cases with 0.68 percent and 2.0 percent free-stream disturbance intensities were investigated. The locations of transition are consistent with earlier data. A late-laminar state with significant levels of turbulence is documented. In late-transitional and early-turbulent flows, turbulent Prandtl number and conduction layer thickness values exceed, and the Reynolds analogy factor is less than, values previously measured in fully turbulent flows.

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39

Schmidt, F. W. "Annual review of numerical fluid mechanics and heat transfer volume 1". International Journal of Heat and Fluid Flow 8, nr 4 (grudzień 1987): 336. http://dx.doi.org/10.1016/0142-727x(87)90070-1.

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40

Spizzichino, M., G. Sinibaldi i G. P. Romano. "Experimental investigation on fluid mechanics of micro-channel heat transfer devices". Experimental Thermal and Fluid Science 118 (październik 2020): 110141. http://dx.doi.org/10.1016/j.expthermflusci.2020.110141.

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41

Nassehi, V. "Annual review of numerical fluid mechanics and heat transfer, volume II". Chemical Engineering Journal 42, nr 1 (październik 1989): 69. http://dx.doi.org/10.1016/0300-9467(89)80008-5.

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42

Zierep, J. "Annual Review of Numerical Fluid Mechanics and heat transfer, Volume II". Chemical Engineering and Processing: Process Intensification 28, nr 1 (sierpień 1990): 51. http://dx.doi.org/10.1016/0255-2701(90)85025-y.

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43

Majeed, Amer Hameed, i Yasmin Hamed Abd. "Performance of Heat Exchanger with Nanofluids". Materials Science Forum 1021 (luty 2021): 160–70. http://dx.doi.org/10.4028/www.scientific.net/msf.1021.160.

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The effect of adding nanomaterial of aluminum oxide (Al2O3), titanium oxide (TiO2) and zirconium oxide (ZrO2) in different concentrations of 0.25, 0.5, 0.75, 1.0, and 1.25 g/L to the cold fluid (water) turbulently flowing with different flow rates of 75, 100, 125, 150, and 175 L/min in tube side countercurrently to hot water flowing with a constant flow rate of 60 L/min in the shell side of shell and tube heat exchanger on the heat transfer rates and overall heat transfer coefficients are experimentally studied. It is found that the addition of nanomaterials gives rise to outlet cold (nano) fluids temperatures causing to enhancement averagely 7.74, 11.25, and 17.38 percent for ZrO2, TiO2, and Al2O3 respectively in heat transfer rate and averagely 12.72, 19.47, and 28.71 percent for ZrO2, TiO2, and Al2O3 respectively in overall heat transfer coefficients. The maximum enhancement values in heat transfer rates and in overall heat transfer coefficients are attained at a flow rate of 150 L/min of cold fluid.

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44

Anderson, D. M., i S. H. Davis. "Local fluid and heat flow near contact lines". Journal of Fluid Mechanics 268 (10.06.1994): 231–65. http://dx.doi.org/10.1017/s0022112094001333.

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We consider steady two-dimensional fluid flow and heat transfer near contact lines in single-phase and two-phase systems. Both single- and double-wedge geometries admit separable solutions in plane polar coordinates for both thermal and flow fields. We consider the class of functions which have bounded temperatures and velocities at the corner. When free surfaces are present, we seek local solutions, those that satisfy all local boundary conditions, and partial local solutions, those that satisfy all but the normal-stress boundary condition. Our aim in this work is to describe local fluid and heat flow in problems where these fields are coupled by determining for which wedge angles solutions exist, identifying singularities in the heat flux and stress which are present at contact lines, and determining the dependence of these singularities on the wedge angles. For thermal fields in two phases we identify two modes of heat transfer that are analogous to the two modes identified by Proudman & Asadullah (1988) for two-fluid flow. For non-isothermal flow, locally, convection does not play a role but coupling through thermocapillary effects on non-isothermal free surfaces can arise. We find that under non-isothermal conditions a planar free surface must leave a planar rigid boundary at an angle of π, the same angle found by Michael (1958) for an isothermal rigid/free wedge, in order to satisfy all local boundary conditions. Finally, we find that situations arise where no coupled solutions of the form sought can be found; we discuss means by which alternative solutions can be obtained.

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45

Anderson, D. M., i S. H. Davis. "Local fluid and heat flow near contact lines". Journal of Fluid Mechanics 371 (25.09.1998): 377–78. http://dx.doi.org/10.1017/s0022112098002134.

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Journal of Fluid Mechanics, vol. 268 (1994), pp. 231–265It has recently come to our attention that our paper, which describes Marangoni-driven flow near a contact line, overlooks solutions involving a general thermal boundary condition on the free surface (private communication, S. J. Tavener 1997). These new solutions are applicable for non-isothermal flows in a corner region where one boundary is a rigid plane (and either perfectly insulating or perfectly conducting) and the other is a free surface upon which a general thermal boundary condition is applied. We describe these additional solutions below.

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46

Bhattacharyya, Suvanjan. "Fluid Flow and Heat Transfer in a Heat Exchanger Channel with Short-Length Twisted Tape Turbulator Inserts". Iranian Journal of Science and Technology, Transactions of Mechanical Engineering 44, nr 1 (4.09.2018): 217–27. http://dx.doi.org/10.1007/s40997-018-0251-0.

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47

Jen, T. C., i A. S. Lavine. "A Variable Heat Flux Model of Heat Transfer in Grinding With Boiling". Journal of Heat Transfer 118, nr 2 (1.05.1996): 463–70. http://dx.doi.org/10.1115/1.2825867.

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In grinding processes, the grinding fluid is used to suppress the temperature rise in the grinding zone. Under some circumstances, the grinding fluid may undergo film boiling in the grinding zone, causing the workpiece temperature to rise significantly. The onsets of nucleate boiling and film boiling in the grinding zone are investigated in the present study. A model of heat transfer in grinding was previously developed (Jen and Lavine, 1995), which predicts the temperature and heat fluxes in the grinding zone. With some modification, this model is used here to predict the occurrence of film boiling of the grinding fluid. The dependence of the workpiece background temperature on the various grinding parameters is explored. The workpiece background temperature distribution along the grinding zone, and comparisons with experimental results, are presented.

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48

Ebadian, M. A., i H. Y. Zhang. "Fluid Flow and Heat Transfer in the Crescent-Shaped Lumen Catheter". Journal of Applied Mechanics 60, nr 3 (1.09.1993): 721–27. http://dx.doi.org/10.1115/1.2900864.

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This paper presents a numerical investigation of fluid flow, frequency response in the fully developed region, and convective heat transfer in the entrance region of the crescent-shaped lumen catheter. The catheter is commonly used in the biomedical field to clinically diagnose heart disease and also to treat vessel blockage in surgery. The catheter is subjected to a constant wall temperature. The solution to discretization of the momentum and energy equations is obtained by using the numerically generated boundary fitted coordinate system. According to this method, the complex domain in the physical plane is transformed into a regular square domain in the computational plane. The control volume-based finite difference method is then used to discretize the transformed governing equations. Results for the thermal entry region flow, frequency response, and heat transfer are presented in graphical form. The representative curves illustrating variations of the flow rate, frequency response, damping coefficient, bulk temperature, and the Nusselt numbers with pertinent parameters in the entire thermal entry region are plotted. The optimized catheter design for diagnostic use in the medical industry is also presented graphically.

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49

Chauhan, Dileep Singh, i Paresh Vyas. "Heat Transfer in Hydromagnetic Couette Flow of Compressible Newtonian Fluid". Journal of Engineering Mechanics 121, nr 1 (styczeń 1995): 57–61. http://dx.doi.org/10.1061/(asce)0733-9399(1995)121:1(57).

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Khan, W. A., J. R. Culham i M. M. Yovanovich. "Fluid Flow and Heat Transfer in Power-Law Fluids Across Circular Cylinders: Analytical Study". Journal of Heat Transfer 128, nr 9 (17.02.2006): 870–78. http://dx.doi.org/10.1115/1.2241747.

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An integral approach of the boundary layer analysis is employed for the modeling of fluid flow around and heat transfer from infinite circular cylinders in power-law fluids. The Von Karman-Pohlhausen method is used to solve the momentum integral equation whereas the energy integral equation is solved for both isothermal and isoflux boundary conditions. A fourth-order velocity profile in the hydrodynamic boundary layer and a third-order temperature profile in the thermal boundary layer are used to solve both integral equations. Closed form expressions are obtained for the drag and heat transfer coefficients that can be used for a wide range of the power-law index, and generalized Reynolds and Prandtl numbers. It is found that pseudoplastic fluids offer less skin friction and higher heat transfer coefficients than dilatant fluids. As a result, the drag coefficients decrease and the heat transfer increases with the decrease in power-law index. Comparison of the analytical models with available experimental/numerical data proves the applicability of the integral approach for power-law fluids.

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