Numerical study of thermal streak spacing in turbulent boundary layer with constant heat-flux boundary condition

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TIŠELJ, Iztok ;POGREBNYAK, Elena ;MOSYAK, Albert ;HETSRONI, Gad .
Numerical study of thermal streak spacing in turbulent boundary layer with constant heat-flux boundary condition. 
Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 47, n.8, p. 396-402, july 2017. 
ISSN 0039-2480.
Available at: <https://www.sv-jme.eu/sl/article/numerical-study-of-thermal-streak-spacing-in-turbulent-boundary-layer-with-constant-heat-flux-boundary-condition/>. Date accessed: 25 oct. 2021. 
doi:http://dx.doi.org/.
Tišelj, I., Pogrebnyak, E., Mosyak, A., & Hetsroni, G.
(2001).
Numerical study of thermal streak spacing in turbulent boundary layer with constant heat-flux boundary condition.
Strojniški vestnik - Journal of Mechanical Engineering, 47(8), 396-402.
doi:http://dx.doi.org/
@article{.,
	author = {Iztok  Tišelj and Elena  Pogrebnyak and Albert  Mosyak and Gad  Hetsroni},
	title = {Numerical study of thermal streak spacing in turbulent boundary layer with constant heat-flux boundary condition},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {47},
	number = {8},
	year = {2001},
	keywords = {Numerical study; thermal streak; turbulent boundary layer; heat-flux boundary condition; },
	abstract = {Direct numerical simulation (DNS) of the fully developed thermal field in a flume was performed. Constant heat flux boundary condition was imposed on the heated bottom in a way, which allowed tracing of the temperature fluctuations on the wall. Free surface boundary conditions for momentum and adiabatic boundary condition for temperature were applied on the free surface. Ill-posedness of the energy equation with such boundary conditions was removed with an additional constrain: average non-dimensional wall temperature was fixed to zero. DNS was performed at constant friction Reynolds number Re=171 and Prandtl numbers 1 and 5.4. The type of the boundary condition did not affect the profile of the mean temperature. The main difference between two types of boundary conditions is in the temperature RMS fluctuations, which retain a nonzero value on the wall for constant heat flux boundary condition, and zero for constant non-dimensional temperature. Certain changes are visible also in the behavior of skewness, flatness, and other turbulent statistics in the near-wall region. An important issue is the difference between the thermal streak spacing on the isoflux wall and the velocity streak spacing near the wall. While the thermal streaks closely follow the velocity streaks for isotemperature wall boundary condition, the temperature streaks near the isoflux wall do not coincide with the velocity low speed streaks. The DNS shows that thermal streak spacing near the wall depends on Prandtl number. Thermal streak spacing is larger than the velocity streak spacing and is approaching to the well known value of the velocity streak spacing (90-100 wall units) at Prandtl number Pr=5.4.},
	issn = {0039-2480},	pages = {396-402},	doi = {},
	url = {https://www.sv-jme.eu/sl/article/numerical-study-of-thermal-streak-spacing-in-turbulent-boundary-layer-with-constant-heat-flux-boundary-condition/}
}
Tišelj, I.,Pogrebnyak, E.,Mosyak, A.,Hetsroni, G.
2001 July 47. Numerical study of thermal streak spacing in turbulent boundary layer with constant heat-flux boundary condition. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 47:8
%A Tišelj, Iztok 
%A Pogrebnyak, Elena 
%A Mosyak, Albert 
%A Hetsroni, Gad 
%D 2001
%T Numerical study of thermal streak spacing in turbulent boundary layer with constant heat-flux boundary condition
%B 2001
%9 Numerical study; thermal streak; turbulent boundary layer; heat-flux boundary condition; 
%! Numerical study of thermal streak spacing in turbulent boundary layer with constant heat-flux boundary condition
%K Numerical study; thermal streak; turbulent boundary layer; heat-flux boundary condition; 
%X Direct numerical simulation (DNS) of the fully developed thermal field in a flume was performed. Constant heat flux boundary condition was imposed on the heated bottom in a way, which allowed tracing of the temperature fluctuations on the wall. Free surface boundary conditions for momentum and adiabatic boundary condition for temperature were applied on the free surface. Ill-posedness of the energy equation with such boundary conditions was removed with an additional constrain: average non-dimensional wall temperature was fixed to zero. DNS was performed at constant friction Reynolds number Re=171 and Prandtl numbers 1 and 5.4. The type of the boundary condition did not affect the profile of the mean temperature. The main difference between two types of boundary conditions is in the temperature RMS fluctuations, which retain a nonzero value on the wall for constant heat flux boundary condition, and zero for constant non-dimensional temperature. Certain changes are visible also in the behavior of skewness, flatness, and other turbulent statistics in the near-wall region. An important issue is the difference between the thermal streak spacing on the isoflux wall and the velocity streak spacing near the wall. While the thermal streaks closely follow the velocity streaks for isotemperature wall boundary condition, the temperature streaks near the isoflux wall do not coincide with the velocity low speed streaks. The DNS shows that thermal streak spacing near the wall depends on Prandtl number. Thermal streak spacing is larger than the velocity streak spacing and is approaching to the well known value of the velocity streak spacing (90-100 wall units) at Prandtl number Pr=5.4.
%U https://www.sv-jme.eu/sl/article/numerical-study-of-thermal-streak-spacing-in-turbulent-boundary-layer-with-constant-heat-flux-boundary-condition/
%0 Journal Article
%R 
%& 396
%P 7
%J Strojniški vestnik - Journal of Mechanical Engineering
%V 47
%N 8
%@ 0039-2480
%8 2017-07-07
%7 2017-07-07
Tišelj, Iztok, Elena  Pogrebnyak, Albert  Mosyak, & Gad  Hetsroni.
"Numerical study of thermal streak spacing in turbulent boundary layer with constant heat-flux boundary condition." Strojniški vestnik - Journal of Mechanical Engineering [Online], 47.8 (2001): 396-402. Web.  25 Oct. 2021
TY  - JOUR
AU  - Tišelj, Iztok 
AU  - Pogrebnyak, Elena 
AU  - Mosyak, Albert 
AU  - Hetsroni, Gad 
PY  - 2001
TI  - Numerical study of thermal streak spacing in turbulent boundary layer with constant heat-flux boundary condition
JF  - Strojniški vestnik - Journal of Mechanical Engineering
DO  - 
KW  - Numerical study; thermal streak; turbulent boundary layer; heat-flux boundary condition; 
N2  - Direct numerical simulation (DNS) of the fully developed thermal field in a flume was performed. Constant heat flux boundary condition was imposed on the heated bottom in a way, which allowed tracing of the temperature fluctuations on the wall. Free surface boundary conditions for momentum and adiabatic boundary condition for temperature were applied on the free surface. Ill-posedness of the energy equation with such boundary conditions was removed with an additional constrain: average non-dimensional wall temperature was fixed to zero. DNS was performed at constant friction Reynolds number Re=171 and Prandtl numbers 1 and 5.4. The type of the boundary condition did not affect the profile of the mean temperature. The main difference between two types of boundary conditions is in the temperature RMS fluctuations, which retain a nonzero value on the wall for constant heat flux boundary condition, and zero for constant non-dimensional temperature. Certain changes are visible also in the behavior of skewness, flatness, and other turbulent statistics in the near-wall region. An important issue is the difference between the thermal streak spacing on the isoflux wall and the velocity streak spacing near the wall. While the thermal streaks closely follow the velocity streaks for isotemperature wall boundary condition, the temperature streaks near the isoflux wall do not coincide with the velocity low speed streaks. The DNS shows that thermal streak spacing near the wall depends on Prandtl number. Thermal streak spacing is larger than the velocity streak spacing and is approaching to the well known value of the velocity streak spacing (90-100 wall units) at Prandtl number Pr=5.4.
UR  - https://www.sv-jme.eu/sl/article/numerical-study-of-thermal-streak-spacing-in-turbulent-boundary-layer-with-constant-heat-flux-boundary-condition/
@article{{}{.},
	author = {Tišelj, I., Pogrebnyak, E., Mosyak, A., Hetsroni, G.},
	title = {Numerical study of thermal streak spacing in turbulent boundary layer with constant heat-flux boundary condition},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {47},
	number = {8},
	year = {2001},
	doi = {},
	url = {https://www.sv-jme.eu/sl/article/numerical-study-of-thermal-streak-spacing-in-turbulent-boundary-layer-with-constant-heat-flux-boundary-condition/}
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TY  - JOUR
AU  - Tišelj, Iztok 
AU  - Pogrebnyak, Elena 
AU  - Mosyak, Albert 
AU  - Hetsroni, Gad 
PY  - 2017/07/07
TI  - Numerical study of thermal streak spacing in turbulent boundary layer with constant heat-flux boundary condition
JF  - Strojniški vestnik - Journal of Mechanical Engineering; Vol 47, No 8 (2001): Strojniški vestnik - Journal of Mechanical Engineering
DO  - 
KW  - Numerical study, thermal streak, turbulent boundary layer, heat-flux boundary condition, 
N2  - Direct numerical simulation (DNS) of the fully developed thermal field in a flume was performed. Constant heat flux boundary condition was imposed on the heated bottom in a way, which allowed tracing of the temperature fluctuations on the wall. Free surface boundary conditions for momentum and adiabatic boundary condition for temperature were applied on the free surface. Ill-posedness of the energy equation with such boundary conditions was removed with an additional constrain: average non-dimensional wall temperature was fixed to zero. DNS was performed at constant friction Reynolds number Re=171 and Prandtl numbers 1 and 5.4. The type of the boundary condition did not affect the profile of the mean temperature. The main difference between two types of boundary conditions is in the temperature RMS fluctuations, which retain a nonzero value on the wall for constant heat flux boundary condition, and zero for constant non-dimensional temperature. Certain changes are visible also in the behavior of skewness, flatness, and other turbulent statistics in the near-wall region. An important issue is the difference between the thermal streak spacing on the isoflux wall and the velocity streak spacing near the wall. While the thermal streaks closely follow the velocity streaks for isotemperature wall boundary condition, the temperature streaks near the isoflux wall do not coincide with the velocity low speed streaks. The DNS shows that thermal streak spacing near the wall depends on Prandtl number. Thermal streak spacing is larger than the velocity streak spacing and is approaching to the well known value of the velocity streak spacing (90-100 wall units) at Prandtl number Pr=5.4.
UR  - https://www.sv-jme.eu/sl/article/numerical-study-of-thermal-streak-spacing-in-turbulent-boundary-layer-with-constant-heat-flux-boundary-condition/
Tišelj, Iztok, Pogrebnyak, Elena, Mosyak, Albert, AND Hetsroni, Gad.
"Numerical study of thermal streak spacing in turbulent boundary layer with constant heat-flux boundary condition" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 47 Number 8 (07 July 2017)

Avtorji

Inštitucije

  • Technion - Isreal Institute of Technology, Department of Mechanical Engineering, Israel
  • Technion - Isreal Institute of Technology, Department of Mechanical Engineering, Israel
  • Technion - Isreal Institute of Technology, Department of Mechanical Engineering, Israel
  • Technion - Isreal Institute of Technology, Department of Mechanical Engineering, Israel

Informacije o papirju

Strojniški vestnik - Journal of Mechanical Engineering 47(2001)8, 396-402

Direct numerical simulation (DNS) of the fully developed thermal field in a flume was performed. Constant heat flux boundary condition was imposed on the heated bottom in a way, which allowed tracing of the temperature fluctuations on the wall. Free surface boundary conditions for momentum and adiabatic boundary condition for temperature were applied on the free surface. Ill-posedness of the energy equation with such boundary conditions was removed with an additional constrain: average non-dimensional wall temperature was fixed to zero. DNS was performed at constant friction Reynolds number Re=171 and Prandtl numbers 1 and 5.4. The type of the boundary condition did not affect the profile of the mean temperature. The main difference between two types of boundary conditions is in the temperature RMS fluctuations, which retain a nonzero value on the wall for constant heat flux boundary condition, and zero for constant non-dimensional temperature. Certain changes are visible also in the behavior of skewness, flatness, and other turbulent statistics in the near-wall region. An important issue is the difference between the thermal streak spacing on the isoflux wall and the velocity streak spacing near the wall. While the thermal streaks closely follow the velocity streaks for isotemperature wall boundary condition, the temperature streaks near the isoflux wall do not coincide with the velocity low speed streaks. The DNS shows that thermal streak spacing near the wall depends on Prandtl number. Thermal streak spacing is larger than the velocity streak spacing and is approaching to the well known value of the velocity streak spacing (90-100 wall units) at Prandtl number Pr=5.4.

Numerical study; thermal streak; turbulent boundary layer; heat-flux boundary condition;