Heat transfer of turbulent gaseous flow in microtubes with constant wall temperature
In this paper, we report on experimental results to measure the total temperature of nitrogen gas at the inlet and outlet of microtubes with constant wall temperature and to quantitatively determine the heat transfer rates. Experiments were conducted with nitrogen gas flowing in a stainless steel mi...
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| Format: | Article |
| Language: | English |
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American Society of Mechanical Engineers (ASME)
2022
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| Online Access: | http://eprints.utm.my/103253/1/AsakoYutaka2022_HeatTransferofTurbulentGaseousFlow.pdf |
| _version_ | 1796867424744636416 |
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| author | Hong, Chungpyo Asako, Yutaka Mohammad Faghri, Mohammad Faghri Ueno, Ichiro |
| author_facet | Hong, Chungpyo Asako, Yutaka Mohammad Faghri, Mohammad Faghri Ueno, Ichiro |
| author_sort | Hong, Chungpyo |
| collection | ePrints |
| description | In this paper, we report on experimental results to measure the total temperature of nitrogen gas at the inlet and outlet of microtubes with constant wall temperature and to quantitatively determine the heat transfer rates. Experiments were conducted with nitrogen gas flowing in a stainless steel microtube with a diameter of 524 μm and a copper microtube with a diameter of 537 μm. The temperature differences between the inlet and the wall were maintained at 3, 5, and 10 K by circulating water around the inlet and the wall. The stagnation pressures were also controlled so that the flow, with atmospheric back pressure, could reach Reynolds numbers as high as 26,000. To measure the total temperature, a polystyrene tube with a thermally insulated exterior wall containing six plastic baffles was attached to the outlet. Heat transfer rates were obtained from the gas enthalpy difference by using the pressures and the total temperatures measured at the inlet and outlet. Heat transfer rates were also compared with those obtained from the ideal gas enthalpy using the measured total temperatures and from the Nusselt number of incompressible flows. It was found that the measured total temperature at the microtube outlet was higher than the wall temperature. Also, the heat transfer rates calculated from the total temperature difference were higher than the values obtained from the incompressible flow theory. |
| first_indexed | 2024-03-05T21:27:03Z |
| format | Article |
| id | utm.eprints-103253 |
| institution | Universiti Teknologi Malaysia - ePrints |
| language | English |
| last_indexed | 2024-03-05T21:27:03Z |
| publishDate | 2022 |
| publisher | American Society of Mechanical Engineers (ASME) |
| record_format | dspace |
| spelling | utm.eprints-1032532023-10-24T10:02:53Z http://eprints.utm.my/103253/ Heat transfer of turbulent gaseous flow in microtubes with constant wall temperature Hong, Chungpyo Asako, Yutaka Mohammad Faghri, Mohammad Faghri Ueno, Ichiro TJ Mechanical engineering and machinery In this paper, we report on experimental results to measure the total temperature of nitrogen gas at the inlet and outlet of microtubes with constant wall temperature and to quantitatively determine the heat transfer rates. Experiments were conducted with nitrogen gas flowing in a stainless steel microtube with a diameter of 524 μm and a copper microtube with a diameter of 537 μm. The temperature differences between the inlet and the wall were maintained at 3, 5, and 10 K by circulating water around the inlet and the wall. The stagnation pressures were also controlled so that the flow, with atmospheric back pressure, could reach Reynolds numbers as high as 26,000. To measure the total temperature, a polystyrene tube with a thermally insulated exterior wall containing six plastic baffles was attached to the outlet. Heat transfer rates were obtained from the gas enthalpy difference by using the pressures and the total temperatures measured at the inlet and outlet. Heat transfer rates were also compared with those obtained from the ideal gas enthalpy using the measured total temperatures and from the Nusselt number of incompressible flows. It was found that the measured total temperature at the microtube outlet was higher than the wall temperature. Also, the heat transfer rates calculated from the total temperature difference were higher than the values obtained from the incompressible flow theory. American Society of Mechanical Engineers (ASME) 2022 Article PeerReviewed application/pdf en http://eprints.utm.my/103253/1/AsakoYutaka2022_HeatTransferofTurbulentGaseousFlow.pdf Hong, Chungpyo and Asako, Yutaka and Mohammad Faghri, Mohammad Faghri and Ueno, Ichiro (2022) Heat transfer of turbulent gaseous flow in microtubes with constant wall temperature. Journal of Heat Transfer, 144 (4). pp. 1-9. ISSN 0022-1481 http://dx.doi.org/10.1115/1.4053215 DOI: 10.1115/1.4053215 |
| spellingShingle | TJ Mechanical engineering and machinery Hong, Chungpyo Asako, Yutaka Mohammad Faghri, Mohammad Faghri Ueno, Ichiro Heat transfer of turbulent gaseous flow in microtubes with constant wall temperature |
| title | Heat transfer of turbulent gaseous flow in microtubes with constant wall temperature |
| title_full | Heat transfer of turbulent gaseous flow in microtubes with constant wall temperature |
| title_fullStr | Heat transfer of turbulent gaseous flow in microtubes with constant wall temperature |
| title_full_unstemmed | Heat transfer of turbulent gaseous flow in microtubes with constant wall temperature |
| title_short | Heat transfer of turbulent gaseous flow in microtubes with constant wall temperature |
| title_sort | heat transfer of turbulent gaseous flow in microtubes with constant wall temperature |
| topic | TJ Mechanical engineering and machinery |
| url | http://eprints.utm.my/103253/1/AsakoYutaka2022_HeatTransferofTurbulentGaseousFlow.pdf |
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