The influence of return bends on the downstream pressure drop and condensation heat transfer in tubes
The influence of return bends on the downstream pressure drop and heat transfer coefficient of condensing refrigerant R-12 was studied experimentally. Flow patterns in glass return bends of 1/2 to 1 in. radius and 0.315 in. I. D. were examined visually and photographically using a high frequency xen...
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| Format: | Technical Report |
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Cambridge, Mass. : M.I.T. Heat Transfer Laboratory, [1971]
2011
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| Online Access: | http://hdl.handle.net/1721.1/61502 |
| _version_ | 1811075040852049920 |
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| author | Traviss, Donald P. Rohsenow, Warren M. |
| author2 | Massachusetts Institute of Technology. Division of Sponsored Research. |
| author_facet | Massachusetts Institute of Technology. Division of Sponsored Research. Traviss, Donald P. Rohsenow, Warren M. |
| author_sort | Traviss, Donald P. |
| collection | MIT |
| description | The influence of return bends on the downstream pressure drop and heat transfer coefficient of condensing refrigerant R-12 was studied experimentally. Flow patterns in glass return bends of 1/2 to 1 in. radius and 0.315 in. I. D. were examined visually and photographically using a high frequency xenon light source. Local pressure drop and heat transfer measurements were made along a horizontal 14 1/2 ft. test section immediately following the return bend. The refrigerant mass flux ranged from 1.32 X 105 to 4.58 X 105 lbm/hr-ft 2, saturation temperature from 90 to 107*F, and return bend quality from 0.24 to 1.0. The pressure drop and heat transfer data were compared to previous data for condensation without return bends. Effects on the downstream pressure drop and heat transfer were found to be small, if not negligible. |
| first_indexed | 2024-09-23T09:59:42Z |
| format | Technical Report |
| id | mit-1721.1/61502 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T09:59:42Z |
| publishDate | 2011 |
| publisher | Cambridge, Mass. : M.I.T. Heat Transfer Laboratory, [1971] |
| record_format | dspace |
| spelling | mit-1721.1/615022019-04-12T11:58:04Z The influence of return bends on the downstream pressure drop and condensation heat transfer in tubes Traviss, Donald P. Rohsenow, Warren M. Massachusetts Institute of Technology. Division of Sponsored Research. Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Heat Transfer Laboratory. Heat -- Transmission. Refrigerants. Condensation. Tubes -- Fluid dynamics. The influence of return bends on the downstream pressure drop and heat transfer coefficient of condensing refrigerant R-12 was studied experimentally. Flow patterns in glass return bends of 1/2 to 1 in. radius and 0.315 in. I. D. were examined visually and photographically using a high frequency xenon light source. Local pressure drop and heat transfer measurements were made along a horizontal 14 1/2 ft. test section immediately following the return bend. The refrigerant mass flux ranged from 1.32 X 105 to 4.58 X 105 lbm/hr-ft 2, saturation temperature from 90 to 107*F, and return bend quality from 0.24 to 1.0. The pressure drop and heat transfer data were compared to previous data for condensation without return bends. Effects on the downstream pressure drop and heat transfer were found to be small, if not negligible. Sponsored by Technical Committee 1.3, American Society of Heating, Refrigeration, and Air Conditioning Engineers DSR Project 2011-03-04T23:40:16Z 2011-03-04T23:40:16Z 1971 Technical Report 14120954 http://hdl.handle.net/1721.1/61502 Technical report (Massachusetts Institute of Technology, Heat Transfer Laboratory) ; no. 75. 77 p application/pdf Cambridge, Mass. : M.I.T. Heat Transfer Laboratory, [1971] |
| spellingShingle | Heat -- Transmission. Refrigerants. Condensation. Tubes -- Fluid dynamics. Traviss, Donald P. Rohsenow, Warren M. The influence of return bends on the downstream pressure drop and condensation heat transfer in tubes |
| title | The influence of return bends on the downstream pressure drop and condensation heat transfer in tubes |
| title_full | The influence of return bends on the downstream pressure drop and condensation heat transfer in tubes |
| title_fullStr | The influence of return bends on the downstream pressure drop and condensation heat transfer in tubes |
| title_full_unstemmed | The influence of return bends on the downstream pressure drop and condensation heat transfer in tubes |
| title_short | The influence of return bends on the downstream pressure drop and condensation heat transfer in tubes |
| title_sort | influence of return bends on the downstream pressure drop and condensation heat transfer in tubes |
| topic | Heat -- Transmission. Refrigerants. Condensation. Tubes -- Fluid dynamics. |
| url | http://hdl.handle.net/1721.1/61502 |
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