Effect of low reynolds number mixed convection on channel flows structure

Ahmed Elatar; Kamran Siddiqui

doi:10.1115/FEDSM2012-72142

Effect of low reynolds number mixed convection on channel flows structure

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The effect of wall heating on low Reynolds numbers channel flow has been investigated experimentally. The experiments were conducted at heated bottom wall temperatures from 30°C to 50°C for two flow rates 0.0210 and 0.0525 kg/s, corresponding to the Reynolds number range of 150 and 750 (in the absence of heating). The results showed that the initially laminar flow became turbulent due to wall heating, and that wall heating has a significant influence on both the mean and turbulent velocity fields. The mean velocity profiles were altered by the convective currents. The magnitude of mean streamwise velocity near the heated wall increased with an increase in the wall temperature. A back flow near the upper channel wall was also observed primarily at the lower flow rate which diminished for the high flow rate. The magnitude of backflow increased with an increase in the wall temperature. The turbulent intensities were found to increase with an increase in the wall temperature for both flow rates. The result also showed the presence of strong vortices originating from the heated wall and advecting towards the central core of the channel.

Original language	English
Title of host publication	ASME 2012 Fluids Engineering Division Summer Meeting Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th Int. Conf. on Nanochannels, Microchannels, and M, FEDSM 2012
Pages	723-729
Number of pages	7
Edition	PARTS A AND B
DOIs	https://doi.org/10.1115/FEDSM2012-72142
State	Published - 2012
Externally published	Yes
Event	ASME 2012 Fluids Engineering Division Summer Meeting, FEDSM 2012 Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and M, FEDSM 2012 - Rio Grande, Puerto Rico Duration: Jul 8 2012 → Jul 12 2012

Publication series

Name	American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
Number	PARTS A AND B
Volume	1
ISSN (Print)	0888-8116

Conference

Conference	ASME 2012 Fluids Engineering Division Summer Meeting, FEDSM 2012 Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and M, FEDSM 2012
Country/Territory	Puerto Rico
City	Rio Grande
Period	07/8/12 → 07/12/12

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10.1115/FEDSM2012-72142

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Elatar, A., & Siddiqui, K. (2012). Effect of low reynolds number mixed convection on channel flows structure. In ASME 2012 Fluids Engineering Division Summer Meeting Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th Int. Conf. on Nanochannels, Microchannels, and M, FEDSM 2012 (PARTS A AND B ed., pp. 723-729). (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM; Vol. 1, No. PARTS A AND B). https://doi.org/10.1115/FEDSM2012-72142

Elatar, Ahmed ; Siddiqui, Kamran. / Effect of low reynolds number mixed convection on channel flows structure. ASME 2012 Fluids Engineering Division Summer Meeting Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th Int. Conf. on Nanochannels, Microchannels, and M, FEDSM 2012. PARTS A AND B. ed. 2012. pp. 723-729 (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM; PARTS A AND B).

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title = "Effect of low reynolds number mixed convection on channel flows structure",

abstract = "The effect of wall heating on low Reynolds numbers channel flow has been investigated experimentally. The experiments were conducted at heated bottom wall temperatures from 30°C to 50°C for two flow rates 0.0210 and 0.0525 kg/s, corresponding to the Reynolds number range of 150 and 750 (in the absence of heating). The results showed that the initially laminar flow became turbulent due to wall heating, and that wall heating has a significant influence on both the mean and turbulent velocity fields. The mean velocity profiles were altered by the convective currents. The magnitude of mean streamwise velocity near the heated wall increased with an increase in the wall temperature. A back flow near the upper channel wall was also observed primarily at the lower flow rate which diminished for the high flow rate. The magnitude of backflow increased with an increase in the wall temperature. The turbulent intensities were found to increase with an increase in the wall temperature for both flow rates. The result also showed the presence of strong vortices originating from the heated wall and advecting towards the central core of the channel.",

author = "Ahmed Elatar and Kamran Siddiqui",

year = "2012",

doi = "10.1115/FEDSM2012-72142",

language = "English",

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series = "American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM",

number = "PARTS A AND B",

pages = "723--729",

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edition = "PARTS A AND B",

note = "ASME 2012 Fluids Engineering Division Summer Meeting, FEDSM 2012 Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and M, FEDSM 2012 ; Conference date: 08-07-2012 Through 12-07-2012",

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Elatar, A & Siddiqui, K 2012, Effect of low reynolds number mixed convection on channel flows structure. in ASME 2012 Fluids Engineering Division Summer Meeting Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th Int. Conf. on Nanochannels, Microchannels, and M, FEDSM 2012. PARTS A AND B edn, American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM, no. PARTS A AND B, vol. 1, pp. 723-729, ASME 2012 Fluids Engineering Division Summer Meeting, FEDSM 2012 Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and M, FEDSM 2012, Rio Grande, Puerto Rico, 07/8/12. https://doi.org/10.1115/FEDSM2012-72142

Effect of low reynolds number mixed convection on channel flows structure. / Elatar, Ahmed; Siddiqui, Kamran.
ASME 2012 Fluids Engineering Division Summer Meeting Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th Int. Conf. on Nanochannels, Microchannels, and M, FEDSM 2012. PARTS A AND B. ed. 2012. p. 723-729 (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM; Vol. 1, No. PARTS A AND B).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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PY - 2012

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N2 - The effect of wall heating on low Reynolds numbers channel flow has been investigated experimentally. The experiments were conducted at heated bottom wall temperatures from 30°C to 50°C for two flow rates 0.0210 and 0.0525 kg/s, corresponding to the Reynolds number range of 150 and 750 (in the absence of heating). The results showed that the initially laminar flow became turbulent due to wall heating, and that wall heating has a significant influence on both the mean and turbulent velocity fields. The mean velocity profiles were altered by the convective currents. The magnitude of mean streamwise velocity near the heated wall increased with an increase in the wall temperature. A back flow near the upper channel wall was also observed primarily at the lower flow rate which diminished for the high flow rate. The magnitude of backflow increased with an increase in the wall temperature. The turbulent intensities were found to increase with an increase in the wall temperature for both flow rates. The result also showed the presence of strong vortices originating from the heated wall and advecting towards the central core of the channel.

AB - The effect of wall heating on low Reynolds numbers channel flow has been investigated experimentally. The experiments were conducted at heated bottom wall temperatures from 30°C to 50°C for two flow rates 0.0210 and 0.0525 kg/s, corresponding to the Reynolds number range of 150 and 750 (in the absence of heating). The results showed that the initially laminar flow became turbulent due to wall heating, and that wall heating has a significant influence on both the mean and turbulent velocity fields. The mean velocity profiles were altered by the convective currents. The magnitude of mean streamwise velocity near the heated wall increased with an increase in the wall temperature. A back flow near the upper channel wall was also observed primarily at the lower flow rate which diminished for the high flow rate. The magnitude of backflow increased with an increase in the wall temperature. The turbulent intensities were found to increase with an increase in the wall temperature for both flow rates. The result also showed the presence of strong vortices originating from the heated wall and advecting towards the central core of the channel.

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Y2 - 8 July 2012 through 12 July 2012

ER -

Elatar A, Siddiqui K. Effect of low reynolds number mixed convection on channel flows structure. In ASME 2012 Fluids Engineering Division Summer Meeting Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th Int. Conf. on Nanochannels, Microchannels, and M, FEDSM 2012. PARTS A AND B ed. 2012. p. 723-729. (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM; PARTS A AND B). doi: 10.1115/FEDSM2012-72142

Effect of low reynolds number mixed convection on channel flows structure

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