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Relevant bibliographies by topics / Heat Convection

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Academic literature on the topic 'Heat Convection'

Author: Grafiati

Published: 4 June 2021

Last updated: 28 July 2024

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Journal articles on the topic "Heat Convection"

1

Wang, Yin, Pik-Yin Lai, Hao Song, and Penger Tong. "Mechanism of large-scale flow reversals in turbulent thermal convection." Science Advances 4, no. 11 (November 2018): eaat7480. http://dx.doi.org/10.1126/sciadv.aat7480.

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It is commonly believed that heat flux passing through a closed thermal convection system is balanced so that the convection system can remain at a steady state. Here, we report a new kind of convective instability for turbulent thermal convection, in which the convective flow stays over a long steady “quiet period” having a minute amount of heat accumulation in the convection cell, followed by a short and intermittent “active period” with a massive eruption of thermal plumes to release the accumulated heat. The rare massive eruption of thermal plumes disrupts the existing large-scale circulation across the cell and resets its rotational direction. A careful analysis reveals that the distribution of the plume eruption amplitude follows the generalized extreme value statistics with an upper bound, which changes with the fluid properties of the convecting medium. The experimental findings have important implications to many closed convection systems of geophysical scale, in which massive eruptions and sudden changes in large-scale flow pattern are often observed.

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Fuentes, J. R., Andrew Cumming, Matias Castro-Tapia, and Evan H. Anders. "Heat Transport and Convective Velocities in Compositionally Driven Convection in Neutron Star and White Dwarf Interiors." Astrophysical Journal 950, no. 1 (June 1, 2023): 73. http://dx.doi.org/10.3847/1538-4357/accb56.

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Abstract We investigate heat transport associated with compositionally driven convection driven by crystallization at the ocean–crust interface in accreting neutron stars, or growth of the solid core in cooling white dwarfs. We study the effect of thermal diffusion and rapid rotation on the convective heat transport, using both mixing length theory and numerical simulations of Boussinesq convection. We determine the heat flux, composition gradient, and Péclet number, Pe (the ratio of thermal diffusion time to convective turnover time) as a function of the composition flux. We find two regimes of convection with a rapid transition between them as the composition flux increases. At small Pe, the ratio between the heat flux and composition flux is independent of Pe, because the loss of heat from convecting fluid elements due to thermal diffusion is offset by the smaller composition gradient needed to overcome the reduced thermal buoyancy. At large Pe, the temperature gradient approaches the adiabatic gradient, saturating the heat flux. We discuss the implications for cooling of neutron stars and white dwarfs. Convection in neutron stars spans both regimes. We find rapid mixing of neutron star oceans, with a convective turnover time of the order of weeks to minutes depending on rotation. Except during the early stages of core crystallization, white dwarf convection is in the thermal-diffusion-dominated fingering regime. We find convective velocities much smaller than recent estimates for crystallization-driven dynamos. The small fraction of energy carried as kinetic energy calls into question the effectiveness of crystallization-driven dynamos as an explanation for observed magnetic fields in white dwarfs.

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Xiao, Hui, Zhimin Dong, Rui Long, Kun Yang, and Fang Yuan. "A Study on the Mechanism of Convective Heat Transfer Enhancement Based on Heat Convection Velocity Analysis." Energies 12, no. 21 (November 1, 2019): 4175. http://dx.doi.org/10.3390/en12214175.

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This paper explores the mechanism of convective heat transfer enhancement in a new perspective. In this paper, a new parameter called heat convection velocity is proposed based on the field synergy principle. It is defined as the velocity projection on the temperature gradient vector and reflects the magnitude of the velocity component that contributes to heat convection. Three typical cases are taken into consideration to investigate the influence factors of Nusselt number theoretically. The results indicate that the Nusselt number can be enhanced by increasing the mean heat convection velocity and the dimensionless mean temperature difference. Through theoretical analysis, three suggestions are found for designing heat transfer enhancement components: (a) the overall synergetic effect should be improved; (b) the fluid with lower temperature gradient should be guided to the region where the temperature gradient is higher; (c) temperature distribution should be an interphase distribution of hot and cold fluid. Besides, the heat convection velocity is used to investigate the mechanism of convective heat transfer in the smooth tube. It is found that the increase of Nusselt number is due to the increase of heat convection velocity. In addition, according to design suggestions, a new insert is invented and inserted in the circular tube. With heat convection velocity analysis, it is found that there is much potential of increasing heat convection velocity for enhancing the convective heat transfer in the circular tube.

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Ward, S., J. M. V. Rayner, U. Möller, D. M. Jackson, W. Nachtigall, and J. R. Speakman. "Heat transfer from starlings sturnus vulgaris during flight." Journal of Experimental Biology 202, no. 12 (June 15, 1999): 1589–602. http://dx.doi.org/10.1242/jeb.202.12.1589.

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Infrared thermography was used to measure heat transfer by radiation and the surface temperature of starlings (Sturnus vulgaris) (N=4) flying in a wind tunnel at 6–14 m s-1 and at 15–25 degrees C. Heat transfer by forced convection was calculated from bird surface temperature and biophysical modelling of convective heat transfer coefficients. The legs, head and ventral brachial areas (under the wings) were the hottest parts of the bird (mean values 6.8, 6.0 and 5.3 degrees C, respectively, above air temperature). Thermal gradients between the bird surface and the air decreased at higher air temperatures or during slow flight. The legs were trailed in the air stream during slow flight and when air temperature was high; this could increase heat transfer from the legs from 1 to 12 % of heat transfer by convection, radiation and evaporation (overall heat loss). Overall heat loss at a flight speed of 10.2 m s-1 averaged 11. 3 W, of which radiation accounted for 8 % and convection for 81 %. Convection from the ventral brachial areas was the most important route of heat transfer (19 % of overall heat loss). Of the overall heat loss, 55 % occurred by convection and radiation from the wings, although the primaries and secondaries were the coolest parts of the bird (2.2-2.5 degrees C above air temperature). Calculated heat transfer from flying starlings was most sensitive to accurate measurement of air temperature and convective heat transfer coefficients.

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Zhang, Tong, Shanshan Geng, Xin Mu, Jiamin Chen, Junyi Wang, and Zan Wu. "Thermal Characteristics of a Stratospheric Airship with Natural Convection and External Forced Convection." International Journal of Aerospace Engineering 2019 (September 8, 2019): 1–11. http://dx.doi.org/10.1155/2019/4368046.

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Though convective heat transfer is one of the main factors that dominate the thermal characteristics of stratospheric airships, there is no specific correlation equations for the calculation of convective heat transfer of airships. The equations based on flat plate and sphere models are all in use. To ameliorate the confusing situation of diverse convective heat transfer equations and to end the misuse of them in the thermal characteristic analysis of stratospheric airships, a multinode steady-state model for ellipsoid airships is built. The accuracy of the five widely accepted equations for natural convective heat transfer is compared and analysed on the proposed large-scale airship model by numerical simulation, so does that of the five equations for external forced convective heat transfer. The simulation method is verified by the available experimental data. Simulation results show that the difference of the five natural convection equations is negligible, while that of the five external forced convection equations must be considered in engineering. Forced convection equations with high precision and wide application should be further investigated.

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Zhang, Nan, Yan Wang, and Xiaomeng Lin. "Mesoscale Observational Analysis of Isolated Convection Associated with the Interaction of the Sea Breeze Front and the Gust Front in the Context of the Urban Heat Humid Island Effect." Atmosphere 13, no. 4 (April 9, 2022): 603. http://dx.doi.org/10.3390/atmos13040603.

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An isolated convection was unexpectedly initiated in the evening of 1 August 2019 around the Tianjin urban region (TUR), which happened at some distance from the shear line at lower level and the preexisting convection to the South, analyzed by using ERA5 reanalysis data and observations from surface weather stations, and a S-band radar. The results show that, 42 min before the initiation of the convection, the atmospheric thermodynamic conditions around TUR were favorable for the initiation of the isolated convection, although the southerly and vertical shear of the horizontal wind at the lower level was weak. A sea-breeze front approached the TUR and continued to move West, leading to the triggering of the isolated convection in the context of the urban humid heat island (UHHI) effect. Subsequently, the gust front, which was formed between the cold pool away from the TUR and the warm and humid air of the UHHI, moved northward, approached the convection, and collided with sea breeze front, resulting in five reflectivity centers of isolated convection being merged and the convection’s development. Finally, the isolated convection split into two convections that moved away from the TUR and disappeared at 20:36 Beijing Time. The isolated convection was initiated and developed by the interaction of the sea breeze front and gust front in the context of the UHHI effect. The sea breeze front triggered the isolated convection around TUR in the context of the UHHI effect, and the gust front produced by the early convective storms to the south played a vital role in the development of the isolated convection.

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Rivera-Salinas, Jorge-Enrique, Karla-Monzerratt Gregorio-Jáuregui, Heidi-Andrea Fonseca-Florido, Carlos-Alberto Ávila-Orta, Eduardo Ramírez-Vargas, José-Antonio Romero-Serrano, Alejandro Cruz-Ramírez, Víctor-Hugo Gutierréz-Pérez, Seydy-Lizbeth Olvera-Vazquez, and Lucero Rosales-Marines. "Numerical Study Using Microstructure Based Finite Element Modeling of the Onset of Convective Heat Transfer in Closed-Cell Polymeric Foam." Polymers 13, no. 11 (May 28, 2021): 1769. http://dx.doi.org/10.3390/polym13111769.

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The thermal performance of closed-cell foams as an insulation device depends on the thermal conductivity. In these systems, the heat transfer mode associated with the convective contribution is generally ignored, and studies are based on the thermo-physical properties that emerge from the conductive contribution, while others include a term for radiative transport. The criterion found in the literature for disregarding convective heat flux is the cell diameter; however, the cell size for which convection is effectively suppressed has not been clearly disclosed, and it is variously quoted in the range 3–10 mm. In practice, changes in thermal conductivity are also attributed to the convection heat transfer mode; hence, natural convection in porous materials is worthy of research. This work extends the field of study of conjugate heat transfer (convection and conduction) in cellular materials using microstructure-based finite element analysis. For air-based insulating materials, the criteria to consider natural convection (Ra=103) is met by cavities with sizes of 9.06 mm; however, convection is developed into several cavities despite their sizes being lower than 9.06 mm, hence, the average pore size that can effectively suppress the convective heat transfer is 6.0 mm. The amount of heat transported by convection is about 20% of the heat transported by conduction within the foam in a Ra=103, which, in turn, produces an increasing average of the conductivity of about 4.5%, with respect to a constant value.

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Ecke, Robert E., Hans Haucke, and John Wheatley. "Convectively driven superfluid turbulence in dilute solutions of 3He in superfluid 4He." Canadian Journal of Physics 65, no. 11 (November 1, 1987): 1322–27. http://dx.doi.org/10.1139/p87-208.

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A dilute solution of 3He in superfluid 4He usually behaves as a single-component classical fluid in the context of thermal convection. However, certain convective states can be excited that do not seem to exist in classical convection. These states are characterized by noisy temperature fluctuations and a pronounced decrease in heat transport relative to the classical convecting states. Critical convective-flow fields are observed analogous to critical velocities for superfluid turbulence in pipes. The magnitudes of the average critical velocities for these two types of superfluid turbulence are in good agreement. Also, a quantitative estimate of energy dissipation due to the interaction of normal fluid and quantized vortex lines is consistent with the large decrease in heat transport for the turbulent states. These states are identified as states of convectively driven superfluid turbulence.

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Jani, Jaronie Mohd, Sunan Huang, Martin Leary, and Aleksandar Subic. "Analysis of Convective Heat Transfer Coefficient on Shape Memory Alloy Actuatorunder Various Ambient Temperatures with Finite Difference Method." Applied Mechanics and Materials 736 (March 2015): 127–33. http://dx.doi.org/10.4028/www.scientific.net/amm.736.127.

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The demand for shape memory alloy (SMA) actuators for technical applications is steadily increasing; however SMA may have poor deactivation time due to relatively slow convective cooling. Convection heat transfer mechanism plays a critical role in the cooling process, where an increase of air circulation around the SMA actuator (i.e. forced convection) provides a significant improvement in deactivation time compared to the natural convection condition. The rate of convective heat transfer, either natural or forced, is measured by the convection heat transfer coefficient, which may be difficult to predict theoretically due to the numerous dependent variables. In this work, a study of free convective cooling of linear SMAactuators was conducted under various ambient temperatures to experimentally determine the convective heat transfer coefficient. A finite difference equation (FDE) was developed to simulate SMA response, and calibrated with the experimental data to obtain the unknown convectiveheat transfer coefficient, h. These coefficients are then compared with the available theoretical equations, and it was found that Eisakhaniet. almodel provides good agreement with the Experiment-FDE calibrated results. Therefore, FDE is reasonably useful to estimate the convective heat transfer coefficient of SMA actuator experiments under various conditions, with a few identified limitations (e.g. exclusion of other associative heat transfer factors).

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Castro-Tapia, Matias, Andrew Cumming, and J. R. Fuentes. "Fast and Slow Crystallization-driven Convection in White Dwarfs." Astrophysical Journal 969, no. 1 (June 21, 2024): 10. http://dx.doi.org/10.3847/1538-4357/ad4152.

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Abstract We investigate crystallization-driven convection in carbon–oxygen white dwarfs. We present a version of the mixing length theory that self-consistently includes the effects of thermal diffusion and composition gradients, and provides solutions for the convective parameters based on the local heat and composition fluxes. Our formulation smoothly transitions between the regimes of fast adiabatic convection at large Peclet number and slow thermohaline convection at low Peclet number. It also allows for both thermally driven and compositionally driven convection, including correctly accounting for the direction of heat transport for compositionally driven convection in a thermally stable background. We use the MESA stellar evolution code to calculate the composition and heat fluxes during crystallization in different models of cooling white dwarfs, and determine the regime of convection and the convective velocity. We find that convection occurs in the regime of slow thermohaline convection during most of the cooling history of the star. However, at the onset of crystallization, the composition flux is large enough to drive fast overturning convection for a short time (∼10 Myr). We estimate the convective velocities in both of these phases and discuss the implications for explaining observed white dwarf magnetic fields with crystallization-driven dynamos.

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Dissertations / Theses on the topic "Heat Convection"

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Jones, Alastair Stephen. "Convection heat transfer problems." Thesis, Keele University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267356.

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Adams, Thomas M. "Turbulent convection in microchannels." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/19421.

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Keen, D. J. "Combined convection in heat exchangers." Thesis, University of Leeds, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235252.

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França, Francis Ramos. "Inverse thermal design combining radiation, convection and conduction /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.

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Lee, Man. "Forced convection heat transfer in integrated microchannel heat sinks /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?MECH%202006%20LEE.

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Pfautsch, Emily. "Forced convection in nanofluids over a flat plate." Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/5745.

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Thesis (M.S.)--University of Missouri-Columbia, 2008.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 14, 2009) Includes bibliographical references.

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Jansen, Adrian J. "Natural convection above a horizontal heat source." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from the National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA267212.

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Phillips, Richard J. "Forced-convection, liquid-cooled, microchannel heat sinks." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14921.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1987.
MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING
Bibliography: v.2, leaves 286-291.
by Richard J. Phillips.
M.S.

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Taherian, Hessam. "Natural convection heat transfer in heat exchangers with vertical helical coils." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0027/NQ31535.pdf.

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Whitaker, Shree Yvonne. "Optimal cylindrical spines that transfer heat by convection." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 1995. http://digitalcommons.auctr.edu/dissertations/628.

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This paper reports the solution of an optimization problem for spines of cylindrical profile that transfer heat by convection when the spine material has constant thermal conductivity. The volume enclosed by the spine is used as a method of rejecting power from the base surface maintained at a specified temperature. The ultimate goal of this thesis is to find a cylindrical spine of minimum profile volumne which transfers a maximum amount of heat by convection when the thermal conductivity is constant. We compute the geometrical and thermal properties of the optimal cylindrical spine.

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Books on the topic "Heat Convection"

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Jiji, Latif M. Heat Convection. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02971-4.

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Bejan, Adrian. Convection Heat Transfer. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118671627.

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Oosthuizen, P. H. An introduction to convective heat transfer analysis. New York: WCB/McGraw Hill, 1998.

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Oosthuizen, P. H. An introduction to convective heat transfer analysis. New York: WCB/McGraw Hill, 1999.

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1946-, Yener Yamna, and Kakaç S, eds. Solution manual for Convective heat transfer. Boca Raton, Fl: CRC Press, 1995.

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Thomas, Lindon C. Heat transfer. London: Prentice Hall, 1992.

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Thomas, Lindon C. Heat transfer. Englewood Cliffs, N.J: Prentice-Hall, 1991.

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Jiji, Latif M. Heat Convection: Second Edition. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2009.

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Gershuni, G. Z. Thermal vibrational convection. Chichester: John Wiley & Sons, 1998.

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1947-, Galdi G. P., and Straughan B. 1947-, eds. Energy stability and convection: Proceedings of the workshop, Capri, May 1986. Harlow: Longman Scientific & Technical, 1988.

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Book chapters on the topic "Heat Convection"

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Jiji, Latif M. "Free Convection." In Heat Convection, 259–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02971-4_7.

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Yang, Fu-Bao, and Ji-Ping Huang. "Convective Heat Transfer in Porous Materials." In Diffusionics, 129–43. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-0487-3_7.

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AbstractThermal convection stands out as an exceptionally efficient thermal transport mechanism, distinctly separate from conduction and radiation. Yet, the inherently elusive nature of fluid motion poses challenges in accurately controlling convective heat flow. While recent innovations have harnessed thermal convection to achieve effective thermal conductivity, fusing thermal convection in liquids and thermal conduction in solids together to form hybrid thermal metamaterials is still challenging. In this chapter, we introduce the latest progress in convective heat transfer. Leveraging the right porous materials as a medium allows for a harmonious balance and synergy between convection and conduction, establishing stable heat and fluid flows. This paves the way for the innovative advancements in transformation thermotics. These findings demonstrate the remarkable tunability of convective heat transport in complex multicomponent thermal metamaterials.

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Jiji, Latif M. "Basic Concepts." In Heat Convection, 1–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02971-4_1.

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Jiji, Latif M. "CORRELATION EQUATIONS: FORCED AND FREE CONVECTION." In Heat Convection, 387–435. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02971-4_10.

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Jiji, Latif M. "Convection in Microchannels." In Heat Convection, 437–505. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02971-4_11.

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Jiji, Latif M. "Differential Formulation of the Basic Laws." In Heat Convection, 21–67. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02971-4_2.

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Jiji, Latif M. "Exact One-Dimensional Solutions." In Heat Convection, 69–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02971-4_3.

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Jiji, Latif M. "BOUNDARY LAYER FLOW: APPLICATION TO EXTERNAL FLOW." In Heat Convection, 99–160. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02971-4_4.

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Jiji, Latif M. "APPROXIMATE SOLUTIONS: THE INTEGRAL METHOD." In Heat Convection, 161–201. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02971-4_5.

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Jiji, Latif M. "HEAT TRANSFER IN CHANNEL FLOW." In Heat Convection, 203–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02971-4_6.

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Conference papers on the topic "Heat Convection"

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Vadasz, Johnathan J., and Saneshan Govender. "Finite Amplitude Convection in Rotating Porous Media." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47380.

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The linear stability of centrifugally induced convection in rotating porous layers suggests a wide range of possible convective solutions. While the linear solutions indicate possible convective regimes and flow details, it is the non-linear effect that eventually establishes the detailed nature of the convection patterns. The latter is accounted for in a finite amplitude analysis. The results of the finite amplitude analysis via the weak non-linear theory are presented here with the aim to assist in selecting between these solutions and providing further analytical detail on the nature of convection.

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de Vahl Davis, Graham. "Unnatural Natural Convection." In Heat and Mass Transfer Australasia. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/978-1-56700-099-3.20.

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Hoogendoorn, Charles J. "NATURAL CONVECTION IN ENCLOSURES." In International Heat Transfer Conference 8. Connecticut: Begellhouse, 1986. http://dx.doi.org/10.1615/ihtc8.2330.

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"Natural Convection, Mixed Convection." In CONV-09. Proceedings of International Symposium on Convective Heat and Mass Transfer in Sustainable Energy. Connecticut: Begellhouse, 2009. http://dx.doi.org/10.1615/ichmt.2009.conv.470.

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Dostal, Jiri, and Vladimir Havlena. "Convection oriented heat exchanger model." In 2016 12th IEEE International Conference on Control and Automation (ICCA). IEEE, 2016. http://dx.doi.org/10.1109/icca.2016.7505301.

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Churchill, Stuart W. "The Prediction of Natural Convection." In International Heat Transfer Conference 3. Connecticut: Begellhouse, 2019. http://dx.doi.org/10.1615/ihtc3.880.

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Ramachandran, N. "G-JITTER CONVECTION IN ENCLOSURES." In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.2540.

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Wilkie, David. "SOME DOUBTFUL NATURAL CONVECTION CORRELATIONS." In International Heat Transfer Conference 9. Connecticut: Begellhouse, 1990. http://dx.doi.org/10.1615/ihtc9.3300.

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Leble, Sergey, and Witold M. Lewandowski. "NATURAL CONVECTION FROM HORIZONTAL CONIC." In Advances in Heat Transfer Engineering. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/bht4.390.

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Fornalik-Wajs, Elzbieta, Wolfgang Leiner, Janusz S. Szmyd, and Tomasz A. Kowalewski. "EXPERIMENTAL SIMULATION OF MIXED CONVECTION." In Advances in Heat Transfer Engineering. Connecticut: Begellhouse, 2023. http://dx.doi.org/10.1615/bht4.350.

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Reports on the topic "Heat Convection"

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Stratton, R. A., and A. J. Stirling. Examining the dynamical response to convective heating using an idealised version of the Met Office’s Unified Model. Met Office, May 2024. http://dx.doi.org/10.62998/ouao1203.

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In global circulation models, poor coupling between convection parametrizations and the resolved dynamics poses significant obstacles to the representation of a range of convectively coupled atmospheric phenomena. Here we focus on one part of this coupling and ask whether the dynamical response to convection can adequately be captured when convection is parametrized only as heat and moisture sources to the resolved scale, (as is usually the case in convection parametrizations), and without including either mass, or vertical momentum transport terms. To this end, a ‘perfect’ convection parametrization is constructed under idealised conditions, for which the inputs of heat and moisture are derived by coarse-graining higher-resolution reference simulations of convecting plumes. The dynamical response of the ‘perfect’ parametrization is then compared with that of the reference simulation. These experiments are conducted using the Met Office Unified Model running with a horizontal resolution of 30 km in a quiescent atmosphere and show that, provided the heating is applied regularly over short (five minute) time intervals, in a dry model a very similar resulting dynamical response can be obtained, without the need for additional mass transfer or momentum terms. In a wet model, the agreement remains good, with differences of no more than 20% developing. If, however, the heating is applied intermittently, such that only the time-averaged heating is correct (as can be the case when using a CAPE-closed convection scheme), the dynamical response is significantly disrupted, and we conclude that this is likely to be a major contributor to the difficulties in representing convectively-coupled atmospheric phenomena in the Unified Model.

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2

Hartnett, J. P. Single phase channel flow forced convection heat transfer. Office of Scientific and Technical Information (OSTI), April 1999. http://dx.doi.org/10.2172/335180.

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3

Langerman, M. A. Natural convection heat transfer analysis of ATR fuel elements. Office of Scientific and Technical Information (OSTI), May 1992. http://dx.doi.org/10.2172/5084332.

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4

Langerman, M. A. Natural convection heat transfer analysis of ATR fuel elements. Office of Scientific and Technical Information (OSTI), May 1992. http://dx.doi.org/10.2172/10163922.

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5

Britt, T. E. Natural convection burnout heat flux limit for control rods. Office of Scientific and Technical Information (OSTI), April 1986. http://dx.doi.org/10.2172/10172829.

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6

Bassem F. Armaly. Convection Heat Transfer in Three-Dimensional Turbulent Separated/Reattached Flow. Office of Scientific and Technical Information (OSTI), October 2007. http://dx.doi.org/10.2172/918582.

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7

Canaan, R. E. Natural convection heat transfer within horizontal spent nuclear fuel assemblies. Office of Scientific and Technical Information (OSTI), December 1995. http://dx.doi.org/10.2172/573364.

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8

Erbacher, F. J., H. J. Neitzel, and X. Cheng. Passive decay heat removal by natural air convection after severe accidents. Office of Scientific and Technical Information (OSTI), September 1995. http://dx.doi.org/10.2172/107750.

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9

Hata, K., M. Shiotsu, and Y. Takeuchi. Natural convection heat transfer on two horizontal cylinders in liquid sodium. Office of Scientific and Technical Information (OSTI), September 1995. http://dx.doi.org/10.2172/107781.

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Manohar S. Sohal, Piyush Sabharwall, Pattrick Calderoni, Alan K. Wertsching, and S. Brandon Grover. Conceptual Design of Forced Convection Molten Salt Heat Transfer Testing Loop. Office of Scientific and Technical Information (OSTI), September 2010. http://dx.doi.org/10.2172/1000546.

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