Browsing Research Articles (Mechanical and Aeronautical Engineering) by UP Author "Dirker, Jaco"
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Browsing Research Articles (Mechanical and Aeronautical Engineering) by UP Author "Dirker, Jaco"
Now showing items 1-20 of 33
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Okafor, Izuchukwu F.; Dirker, Jaco; Meyer, Josua P. (Taylor and Francis, 2019)Non-symmetric heat flux distributions in terms of gravity in solar collector tubes influence buoyancy-driven secondary flow which has an impact on the associated heat transfer and pressure drop performance. In this study ...
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Ndenguma, Dickson Daniel; Dirker, Jaco; Burger, N.D.L (Nicolaas Daniel Lombard) (Southern African Institute of Mining and Metallurgy, 2014-06)This investigation compares the results from an experimental and numerical study of air flow in a scaled-down underground coal mine model. This was done in order to determine if numerical analysis can be relied upon ...
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Adelaja, Adekunle O.; Dirker, Jaco; Meyer, Josua P. (Elsevier, 2019-02)This paper presents the thermal performance of smooth and microfin tubes and the enhancement factors as they respond to inclination angle, mass flux and vapour quality in inclined tubes of 1.488 m long, 9.55 mm outer ...
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Condensation heat transfer in smooth inclined tubes for R134a at different saturation temperatures Meyer, Josua P.; Dirker, Jaco; Adelaja, Adekunle O. (Elsevier, 2014-03)This paper presents the effects of saturation temperature and inclination angle on convective heat transfer during condensation of R134a in an inclined smooth tube of inner diameter of 8.38 mm. Experiments were conducted ...
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Adelaja, Adekunle O.; Dirker, Jaco; Meyer, Josua P. (Taylor and Francis, 2016-06)An experimental study of convective condensation heat transfer of R134a was conducted in an inclined smooth copper tube of inner diameter of 8.38 mm. The test condenser had a straight copper tube section with an ...
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Noori Rahim Abadi, Seyyed Mohammad Ali; Meyer, Josua P.; Dirker, Jaco (Elsevier, 2018-04)Almost all work on condensation in tubes were conducted for smooth tubes in a horizontal or vertical orientation, and little has been done at other inclination angles. Recent experimental works with condensation at different ...
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Noori Rahim Abadi, Seyyed Mohammad Ali; Mehrabi, Mehdi; Meyer, Josua P.; Dirker, Jaco (Elsevier, 2018-10)In this study, numerical simulations of the condensation of R134a inside an inclined smooth tube are conducted. The effects of different parameters such as saturation temperature, tube inclination angle, vapour quality, ...
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Adelaja, Adekunle O.; Dirker, Jaco; Meyer, Josua P. (Elsevier, 2014-10)Conjugate heat transfer in laminar tube flow with convective boundary conditions is considered analytically. The steady state problem involving two-dimensional wall and axial fluid conduction is solved using separation ...
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Kumirai, T.; Dirker, Jaco; Meyer, Josua P. (Elsevier, 2019-03)Due to climate change and rising global temperatures, energy demand associated with commercial and office building cooling, is projected to increase. Passive-cooling, based on phase change materials, can assist to moderate ...
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Vermaak, M.; Potgieter, J.; Dirker, Jaco; Moghimi, M.A.; Valluri, P.; Sefiane, K.; Meyer, Josua P. (Elsevier, 2020-09)Flow-boiling of Perfluorohexane (FC-72) in horizontal micro/mini channels was investigated experimentally and numerically at different rotational orientations in terms of gravity. One-sided uniform channel heating was ...
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Dirker, Jaco; Meyer, Josua P.; Reid, W.J. (Elsevier, 2018-11)In this experimental investigation the influence of non-uniform heat flux distributions on the internal heat transfer coefficient in a horizontal circular tube was studied for liquid water. The tube had an inner diameter ...
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Adelaja, Adekunle O.; Dirker, Jaco; Meyer, Josua P. (Elsevier, 2017-02)Several applications exist in industry where condensation does not occur in horizontal or vertical tubes but in inclined tubes. Examples are aeroplanes during take-off, landing and banking, automobiles and trucks driving ...
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Ndenguma, Dickson Daniel; Dirker, Jaco; Meyer, Josua P. (Elsevier, 2017-08)An experimental study was conducted to determine the lower and upper Reynolds number limits of the transitional flow regime, and the characteristics of the heat transfer coefficients and friction factors for annular passages ...
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Prinsloo, F.P.A. (Francois); Dirker, Jaco; Meyer, Josua P. (Springer, 2018-04)In this experimental study the heat transfer phenomena in concentric annuli in tube-in-tube heat exchangers at different annular Reynolds numbers, annular diameter ratios, and inlet fluid temperatures using water were ...
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Adelaja, Adekunle O.; Ewim, Daniel Raphael Ejike; Dirker, Jaco; Meyer, Josua P. (Elsevier, 2019-12)This paper presents experimental heat transfer and pressure drop measurements during the condensation of R134a at a mean saturation temperature of 40 °C inside a microfinned copper tube with an inner diameter of 8.92 mm ...
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Van der Westhuizen, Jacob E.; Dirker, Jaco; Meyer, Josua P. (Taylor and Francis, 2016-05)Liquid crystal thermography was used in a water-operated concentric tube-in-tube heat exchanger to determine local annular heat transfer coefficients at the inlet region. An annular diameter ratio of 0.54 was considered ...
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Adelaja, Adekunle O.; Ewim, Daniel Raphael Ejike; Dirker, Jaco; Meyer, Josua P. (Elsevier, 2020-10)To date, there has been no robust model that can satisfactorily predict the condensation heat transfer coefficients in smooth tubes when oriented at some angles other than horizontal and vertical. Therefore, it was the ...
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Okafor, Izuchukwu F.; Dirker, Jaco; Meyer, Josua P. (Elsevier, 2014-09)The absorber tubes of solar thermal collectors have enormous influence on the performance of the solar collector systems. In this numerical study, the influence of circumferential uniform and non-uniform solar heat flux ...
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Martin, A.T.; Dirker, Jaco (Elsevier, 2024-02)Please read abstract in the article.
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Van den Bergh, Wilhelm Johann; Dirker, Jaco; Markides, Christos N.; Meyer, Josua P. (Elsevier, 2022-01)Please read abstract in the article.
Now showing items 1-20 of 33