Natural convection heat transfer along vertical rectangular ducts

Ali, Mohamed

doi:10.1007/s00231-009-0561-2

Cited by 10 publications

(7 citation statements)

References 14 publications

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“…Recorded temperatures of the seven thermocouples against the platinum resistance thermometer at boiling state. Figure 7 shows a comparison between the natural convection heat transfer from the three single tubes and that of Vliet and Liu [1] and Ali [2] for natural convection from vertical plates and vertical square cross-section tubes, respectively. The comparison shows that the current results lie between the envelope of Vliet and Liu [1] and Ali [2], and close to [2] since the current tubes have a square cross-section area similar to that of [2].…”

Section: Resultsmentioning

confidence: 99%

“…Figure 7 shows a comparison between the natural convection heat transfer from the three single tubes and that of Vliet and Liu [1] and Ali [2] for natural convection from vertical plates and vertical square cross-section tubes, respectively. The comparison shows that the current results lie between the envelope of Vliet and Liu [1] and Ali [2], and close to [2] since the current tubes have a square cross-section area similar to that of [2]. Figure 8a,b shows the local circumference averaged Nusselt number Nu x versus the modified local Rayleigh number Ra *…”

Section: Resultsmentioning

confidence: 99%

“…Ali [2] has studied natural convection heat transfer experimentally from vertical uniform surface heat flux tubes with rectangular cross-sections in the air. His empirical correlation for the transition regime was given by Nu x = 0.14 (Ra * x ) 0.269 , 5.0 × 10 9 ≤ Ra * x ≤ 1.5 × 10 16 (2)…”

Section: Introductionmentioning

confidence: 99%

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Center-to-Center Distance’s Effect between Vertical Square Tubes of a Horizontal Array on Natural Convection Heat Transfer

2023

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An experimental study on natural convection heat transfer from the outer surface of a horizontal array of vertical square tubes in the air is investigated. The array consists of three vertical square tubes at equally different center-to-center distances. Each tube has a square cross-section with a side length of 2.00 cm, 100 cm length, and is filled with sand. Each tube is heated by inserting an internal heating element with a constant heat flux at the center. Five center-to-center separation distance to hydraulic diameter ratios (S/D) are used at different heat flux ranges of 70–360 W/m2. Results show that at small S/D, the Nusselt number of any tube in the array is lower than that of the single tube up to a specific S/D and then increases as the ratio increases. Empirical correlations are obtained for each tube in the array at different S/D using the modified Rayleigh numbers only. General correlations using S/D as a parameter are obtained for each tube, and an overall general correlation using both S/D and the tube number (n) as parameters is obtained. The difference between the predicted and experimental Nusselt numbers is in the reasonable range even at high Rayleigh numbers.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Center-to-Center Distance’s Effect between Vertical Square Tubes of a Horizontal Array on Natural Convection Heat Transfer

2023

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“…ÀÁ 0:287 (16) with a correlation coefficient of R ¼ 95:93%. In addition, laminar heat transfer data were aspect ratio and area ratio dependent, as correlated using the modified Rayleigh numbers over averaged basis (Eqs.…”

Section: Cylinders Of Different Cross Sections In Free Convectionmentioning

confidence: 99%

“…where κ is the area ratio (κ = surface area of the cylinder/ cross section area of the cylinder). Ali [16] has investigated experimentally the steady-state free convection from vertical and horizontal cylinders with square or rectangular cross section. Four and three cylinders had square and rectangular cross sections, respectively.…”

Section: Cylinders Of Different Cross Sections In Free Convectionmentioning

confidence: 99%

Free Convection Heat Transfer from Different Objects

Ali¹,

Sadek²

2018

Heat Transfer - Models, Methods and Applications

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Heat transfer by natural convection phenomenon has been studied by diverse researchers for several geometries and different boundary conditions. Different approaches were used such as numerical, analytical, and experimental approaches. In this chapter, we are going to review the most common published research on object shapes in natural convection heat transfer with their obtained numerical, semiempirical, and/or experimental correlations for the last two decades. These correlations are very important for engineering applications. This chapter will be stressed on cylinders in different orientations with cross sections such as circular, square, triangular, vertical, and horizontal coils and array of cylinders of different cross sections.

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Experimental free convection heat transfer from inclined square cylinders

Ali

2016

Heat Mass Transfer

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Natural convection heat transfer along vertical rectangular ducts

Cited by 10 publications

References 14 publications

Center-to-Center Distance’s Effect between Vertical Square Tubes of a Horizontal Array on Natural Convection Heat Transfer

Center-to-Center Distance’s Effect between Vertical Square Tubes of a Horizontal Array on Natural Convection Heat Transfer

Free Convection Heat Transfer from Different Objects

Experimental free convection heat transfer from inclined square cylinders

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