Investigation of New Material for Deterging Heat Exchanger Tube
Mohamed Khaled Mohamed Mohamed Hasanin
Issue:
Volume 12, Issue 2, June 2023
Pages:
17-24
Received:
16 February 2023
Accepted:
10 March 2023
Published:
29 May 2023
Abstract: This work represents new material can be used in cleaning process of heat exchanger tubes. Rubber projectiles are back bone of on line cleaning mechanism but it has poor mechanical and thermal features. Three materials have different properties with micro scale powder solid phase (aluminum, aluminum oxide and copper) had been added to (LSR) with different volume ratios (2%, 5%, 10%, 15%). specimens had been prepared with certain method and under specific conditions. Compression test was applied to identify stiffness factor of these new composite materials. Wear test was applied to finite the wear rare coefficient for these materials. Un certainty statistics was applied for measurements results so It's founded that with increasing volume ratio each of stiffness factor and wear rate coefficient increase linearity up to (15%) for all specimens. copper filler give best for stiffness that stiffness factor reaches about (30 (N/(mm/mm))) at volume ratio 15%) but poorest wear resistance with wear rate coefficient (9*10-6) Mpa-1 inversely aluminum filler gives best results in wear resistance with wear rate coefficient (6*10-6) Mpa-1 but weakest in stiffness test with stiffness factor (28 N/(mm/mm) at volume ratio 15%). Aluminum oxide was the best choice for new projectile material as it combines between good stiffness and wear resistance.
Abstract: This work represents new material can be used in cleaning process of heat exchanger tubes. Rubber projectiles are back bone of on line cleaning mechanism but it has poor mechanical and thermal features. Three materials have different properties with micro scale powder solid phase (aluminum, aluminum oxide and copper) had been added to (LSR) with di...
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A Comparative Study of the Physico-Chemical Properties of Cement-Bonded Particle Boards from Semi-Pulped Bagasse and Newsprints
Olaoluwa Ayobami Ogunkunle,
Charles Emeka Umenwa
Issue:
Volume 12, Issue 2, June 2023
Pages:
25-30
Received:
22 February 2023
Accepted:
24 March 2023
Published:
29 May 2023
Abstract: The objectives of this study were to compare the compatibility of semi-digested pulp and fully digested pulp with cement and to further determine how appropriate these two samples are for the production of outdoor particle boards using the hydration test to determine the compatibility through the compatibility factor obtained using the area ratio method. The effects of chemical additives on the compatibilities of the samples with cement and the existence of bond formation were also looked into. Stems of sugar cane were obtained from the Sabo market in Ile-Ife, Osun state, Nigeria while newspaper prints were also gathered from Obafemi Awolowo University, Ile-Ife, Nigeria. The samples were converted to mesh, bleached and then converted to pulp. Different tests comprising proximate analysis, phytochemical screening, compatibility test and hydration experiment. The results of physical tests showed that bagasse is light yellow in colour while the newsprint is yellow solid in colour. Phytochemical screening results indicated that saponins, alkaloids, and tannins were present in high concentration. Infrared analysis indicated the notable presence of hydroxyl, ester and carbonyl groups in the samples. Based on the compatibility values, the addition of additives such as CaCl2 produced higher compatibility values. The study concluded that semi-pulped bagasse and the newsprints are appropriate for the production of the particle boards.
Abstract: The objectives of this study were to compare the compatibility of semi-digested pulp and fully digested pulp with cement and to further determine how appropriate these two samples are for the production of outdoor particle boards using the hydration test to determine the compatibility through the compatibility factor obtained using the area ratio m...
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