Thermal Properties of Zn5al and Zn55al Alloys with II a Group Elements

Nizomov, Z.; Avezov, Z.I.; Saidov, R.Kh.; Mirzoev, F.M.; Akramov, M.B.

doi:10.4028/p-81t2vt

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…If the body releases heat in such a way that the temperature of all its points changes identically, then equality will be true [37]:…”

Section: Methodsmentioning

confidence: 99%

Size-Dependent Cooling Kinetics of A5N Cylindrical Samples

Nematov¹,

Turakhasanov²,

Nizomov³

2022

Preprint

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The results of the study of the influence of the size of cylindrical samples of A5N aluminum on the time and rate of their cooling are presented. According to experimental data, the temperature dependence of the heat transfer coefficient for pure metals is calculated. It revealed that the process of cooling of the aluminium and its alloys has a relaxation behavior. It has found that the main mechanisms of natural air cooling are convection heat transfer and radiation. The characteristic cooling time due to radiation is less than due to convection. The contribution of thermal radiation is noticeable at high temperatures. It was found that the characteristic times of cooling due to radiation and convection increase with increase in volume to area ratio of the sample.

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“…If the body releases heat in such a way that the temperature of all its points changes identically, then equality will be true [37]:…”

Section: Methodsmentioning

confidence: 99%

Size-Dependent Cooling Kinetics of A5N Cylindrical Samples

Nematov¹,

Turakhasanov²,

Nizomov³

2022

Preprint

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“…Therefore, we can assume that the amount of heat lost through the surface of the body over time will be proportional to time, surface area S, and the difference in body temperature T and the environment T0:𝑑𝑄 𝑠 = −𝛼(𝑇 − 𝑇 0 )𝑆𝑑𝜏. If the body releases heat in such a way that the temperature of all its points changes identically, then equality will be true [37]:…”

Section: Methodsmentioning

confidence: 99%

“…The thermo physical properties of metals and alloys are the most important physical characteristics that determine the patterns of their behavior under various operating conditions [12,[31][32][33][34][35][36][37][38][39][40]. The main interest in metal alloys is primarily due to their widespread use as part of composite alloys in various branches of technology and industry.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Size of A5N Cylindrical Aluminum Specimens on the Cooling Kinetics

Isfandior

Ziyovuddin²,

Nematov³

2022

Trends Sci

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The results of the study of “The influence of the size of cylindrical samples of A5N aluminum on the time and the rate of their cooling” are reported. According to experimental data, the temperature dependence of the heat transfer coefficient for pure metals is calculated. It has revealed that the process of cooling of the aluminum and its alloys has a relaxation behavior. It was found that the main mechanisms of natural air cooling are convection heat transfer and radiation. The characteristic cooling time due to radiation is less due to convection. The contribution of thermal radiation is noticeable at high temperatures. It was found that the characteristic times of cooling due to radiation and convection increase with increase in volume to area ratio of the sample. HIGHLIGHTS Cylindrical Al samples were made with dimensions of 2, 2.5, 3, 3.5 and 4 cm, after cleaning aluminum to grade A5N (99.999 %) The influence of the dimensions of cylindrical aluminum samples on the time and rate of their spontaneous cooling in air has been studied It has been established that the samples are cooled mainly due to convective heat transfer and thermal radiation It became known that the cooling time due to convection is longer than the time due to radiation It has been found that as the V/S value increases, the cooling time increases GRAPHICAL ABSTRACT

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Influence of the Diameter of Cylindrical Samples Made of Different Grades of Aluminum on the Cooling Kinetics

Nizomov,

Turahasanov,

Saidzoda

2023

tnusns

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The influence of the diameter of cylindrical samples from various grades of technical aluminum (A0, A5, A6), aviation AB98 and high-purity aluminum A5N on their characteristic cooling times and rates, as well as on heat transfer processes in a wide temperature range, was studied. It was revealed that cooling of the samples occurs due to convective heat transfer and radiation, which have characteristic times. An assessment of the magnitude of characteristic cooling times due to convective heat transfer and radiation has been carried out. It is shown that the characteristic cooling time due to radiation is less than the characteristic cooling time due to convection. Using experimental data on the cooling rate of the studied samples and theoretically calculated values of their heat capacity according to the Neumann-Kopp rule, heat transfer coefficients for the processes of convective heat transfer and radiation depending on temperature were determined. It has been established that with increasing temperature, the contribution of radiation to the total heat transfer coefficient increases, and the coefficient of convective heat transfer with increasing temperature first increases, then after passing a maximum it decreases. The contribution to the overall heat transfer coefficient from radiation is noticeable at high temperatures. It was revealed that the characteristic cooling times due to radiation and convection increase nonlinearly with increasing sample diameter (V/S). This dependence is explained by a decrease in the heat transfer coefficient with increasing sample diameter. Compared with the patterns of influence of sample size on the thermophysical properties of spherical samples. It was revealed that spherical samples cool faster than cylindrical samples of the same mass, and the heat transfer coefficients are higher.

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Thermal Properties of Zn5al and Zn55al Alloys with II a Group Elements

Cited by 3 publications

References 5 publications

Size-Dependent Cooling Kinetics of A5N Cylindrical Samples

Size-Dependent Cooling Kinetics of A5N Cylindrical Samples

Effect of the Size of A5N Cylindrical Aluminum Specimens on the Cooling Kinetics

Influence of the Diameter of Cylindrical Samples Made of Different Grades of Aluminum on the Cooling Kinetics

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