Numerical and Experimental Study of Natural Convection in a Tunnel Greenhouse Located in South West Algeria (Adrar Region)

In this work, we propose to experimentally and numerically study the natural convection in laminar regime in an agricultural greenhouse located in South West of Algeria and more precisely in the Adrar area. The numerical study is two-dimensional and was carried out on a tunnel greenhouse with an area of 180m2 located in Adrar in the southwest of Algeria (Latitude: 27°52′27″N, longitude: 0°17′37″W, the laltitude above sea level is 257 m), with polyethylene cover and houses two rows of tomato plants. The experimental study was made during the winter or flowering period of tomato plants (February) when the temperature difference outside the greenhouse is maximum: T min = 3℃ at night and T max = 20℃ the day. We used a calculate code based on the finite element method to numerically simulate the phenomenon of heat transfer inside the greenhouse. The results of the numerical simulation are in the form of isotherms, streamlines and variations in temperature and speed in the greenhouse. The value of the temperature calculated by numerical simulation at the position where the sensor has been placed will be compared with that measured by the sensor. It was concluded that to have a favorable environment for the growth of tomatoes, we must keep the openings closed especially during the night without needing a heating system, especially in this region characterized by a hyper arid climate.

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EXPERIMENTAL STUDY ON NATURAL CONVECTION IN A MODEL FIRE ROOM (MEASUREMENT RESULTS OF TURBULENCE QUANTITIES) : Numerical simulation of variable density flow with high buoyancy Part 5

Journal of Architecture and Planning (Transactions of AIJ) ◽

10.3130/aija.64.55_3 ◽

1999 ◽

Vol 64 (521) ◽

pp. 55-62

Author(s):

Ryuichiro YOSHIE ◽

Shuzo MURAKAMI ◽

Shinsuke KATO

Keyword(s):

Numerical Simulation ◽

Experimental Study ◽

Natural Convection ◽

Variable Density ◽

Variable Density Flow ◽

Density Flow ◽

Measurement Results

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Experimental Study of Natural Convection in a Closed Cavity (Static Type Domestic Fridge)

Journal of Engineering ◽

10.31026/j.eng.2021.10.01 ◽

2021 ◽

Vol 27 (10) ◽

pp. 1-19

Author(s):

Maryem Kanaan Adnan ◽

Munther Abdullah Mussa

Keyword(s):

Numerical Simulation ◽

Experimental Study ◽

Natural Convection ◽

Thermal Radiation ◽

Velocity Distribution ◽

Thermal Flow ◽

Closed Cavity ◽

Glass Door ◽

And Behavior ◽

Temperature And Flow Fields

This work provides an analysis of the thermal flow and behavior of the (load-free) refrigerator compartment. The main goal was to compare the thermal behavior inside the refrigerator cavity to the freezer door (home refrigerator) effect and install a fan on the freezer door while neglecting the heat transmitted by thermal radiation. Moreover, the velocity distribution, temperature, and velocity path lines are theoretically studied. This was observed without affecting the shelves inside the cabinet and the egg and butter places on the refrigerator door as they were removed and the aluminum door replaced with a glass door. This study aims to expand our knowledge about the temperature and flow fields of this refrigerator model. Finally, the development of this work highlights the importance of numerical simulation in the search for improvements in the design of this refrigerator model, which may assist refrigerator manufacturers.

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NUMERICAL STUDY ON NATURAL CONVECTION WITH STRONG DENSITY VARIATION ALONG A HEATED VERTICAL PLATE : Numerical simulation of variable density flow with high buoyancy Part3

Journal of Architecture and Planning (Transactions of AIJ) ◽

10.3130/aija.60.45_3 ◽

1995 ◽

Vol 60 (472) ◽

pp. 45-54 ◽

Cited By ~ 5

Author(s):

Shuzo MURAKAMI ◽

Shinsuke KATO ◽

Ryuichiro YOSHIE

Keyword(s):

Numerical Simulation ◽

Natural Convection ◽

Vertical Plate ◽

Numerical Study ◽

Variable Density ◽

Density Variation ◽

Variable Density Flow ◽

Density Flow

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EXPERIMENTAL STUDY ON NATURAL CONVECTION IN A MODEL FIRE ROOM -MEASUREMENT RESULTS OF MEAN QUANTITIES- : Numerical simulation of variable density flow with high buoyancy Part 4

Journal of Architecture and Planning (Transactions of AIJ) ◽

10.3130/aija.63.45_3 ◽

1998 ◽

Vol 63 (510) ◽

pp. 45-52 ◽

Cited By ~ 1

Author(s):

Shinsuke KATO ◽

Shuzo MURAKAMI ◽

Ryuichiro YOSHIE

Keyword(s):

Numerical Simulation ◽

Experimental Study ◽

Natural Convection ◽

Variable Density ◽

Variable Density Flow ◽

Density Flow ◽

Measurement Results

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Numerical Study on the Local Buckling Behaviour of Bolted Steel Plates in Steel Jacketing

Advances in Materials Science and Engineering ◽

10.1155/2017/1352084 ◽

2017 ◽

Vol 2017 ◽

pp. 1-15 ◽

Cited By ~ 9

Author(s):

Xiao-liang Xu ◽

Zhou-dao Lu ◽

Ling-zhi Li ◽

Chang-jiu Jiang

Keyword(s):

Numerical Simulation ◽

Experimental Study ◽

Numerical Model ◽

Parametric Study ◽

Numerical Study ◽

Local Buckling ◽

Initial Imperfection ◽

Field Capacity ◽

Steel Plates ◽

Previous Experimental Study

A numerical simulation was conducted to investigate the local buckling behaviour of the bolted steel plates in steel jacketing technique. The numerical model was firstly validated by the results of a previous experimental study. Then a parametric study was conducted to investigate the influence of different restraint measures on the local buckling behaviour and the sensitivity of the buckling behaviour to the initial imperfection. Fitted formulae were developed to calculate the structural field capacity of the bolted steel plates, and recommended values of stiffener size were also provided to facilitate the strengthening design of steel jacketing.

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Numerical Study on Natural Convection From a Row of Heated Pipes Embedded in an Air-Filled Cavity

Volume 2: Heat Transfer in Multiphase Systems; Gas Turbine Heat Transfer; Manufacturing and Materials Processing; Heat Transfer in Electronic Equipment; Heat and Mass Transfer in Biotechnology; Heat Transfer Under Extreme Conditions; Computational Heat Transfer; Heat Transfer Visualization Gallery; General Papers on Heat Transfer; Multiphase Flow and Heat Transfer; Transport Phenomena in Manufacturing and Materials Processing ◽

10.1115/ht2016-7173 ◽

2016 ◽

Cited By ~ 1

Author(s):

C. C. Ngo ◽

B. A. Alhabeeb

Keyword(s):

Heat Transfer ◽

Natural Convection ◽

Oil And Gas ◽

Numerical Study ◽

Heating System ◽

Industrial Applications ◽

Burial Depth ◽

Buried Pipe ◽

Ansys Fluent ◽

Closed Cavity

Heat transfer from a buried pipe has been a subject of great interest due to its many important engineering applications, which include the underground pipelines for oil and gas transport and the power cables. The problem considered in the present study has applications related to a radiant underfloor heating system in residence and industry. In the existing literature, heat transfer from a buried pipe has been considered for various heat transfer modes and configurations. For example, analytical solutions are readily available for heat conduction from one single cylindrical heat source or multiple heat sources, and the heat transfer results are often expressed in terms of the conduction shape factor. As for heat convection from an array of pipes, most of the existing studies have been focused on external crossflow with forced convection from a bundle of pipes with either aligned or staggered pipe arrangement. This area of research has received much attention due to its important industrial applications in the design of boilers and heat exchangers. On the other hand, studies involved natural convection from an array of pipes are relatively limited. The problem considered in the present study is related to the simulation of underfloor piping systems suspended in the joist space beneath the subfloor. Natural convective heat transfer from a row of horizontal heated pipes embedded in a closed cavity filled with air has been numerically examined in this study. A two-dimensional steady-state model has been developed using ANSYS Fluent for the numerical simulation. A parametric study has been performed to investigate the effects of pipe spacing, pipe depth and pipe temperature on the flow patterns and heat transfer rates. The heat transfer mechanism from the heated pipes to the top surface of the air-filled cavity is revealed through the plots of streamlines and isotherms. The present numerical model has been developed and validated using a parallel experimental study. From the radiant underfloor heating application perspective, the results showed that a radiant heating system with pipes embedded at a shallow burial depth and placed closer together resulted with a more desired surface temperature distribution.

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Natural Convection in a Partially Heat Generating Rod Bundle Inside an Enclosure

Journal of Heat Transfer ◽

10.1115/1.4001610 ◽

2010 ◽

Vol 132 (10) ◽

Cited By ~ 6

Author(s):

D. Jaya Krishna ◽

M. R. Thansekhar ◽

S. P. Venkateshan ◽

Tanmay Basak ◽

Sarit K. Das

Keyword(s):

Heat Transfer ◽

Numerical Simulation ◽

Experimental Study ◽

Porous Media ◽

Natural Convection ◽

Temperature Distribution ◽

Diameter Ratio ◽

Rod Bundles ◽

Rod Bundle ◽

Power Inputs

Buoyancy induced flows in a partially heat generating rod bundle enclosed inside a tall cavity are investigated. First, a detailed experimental study is carried out, and the thermal hydraulics is analyzed at different power inputs and boundary cooling rates of the enclosure. Later, a generalized non-Darcy simulation is developed using a heat generating orthotropic porous media approach and is compared with the experimental results. The results of a numerical simulation for natural convection in enclosed partially heat generating rod bundles satisfactorily predict the temperature distribution within the rod bundle. Finally, a parametric study is carried out by varying the porosity (pitch to diameter ratio of the rod bundle) of the considered enclosure for the understanding of flow physics and heat transfer in such applications.

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