TY  - JOUR
AU  - Petrović, Dragan
AU  - Vukoslavčević, Petar V.
AU  - Wallace, J.M.
PY  - 2010
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2403
AB  - The original concept of a nine-sensor T-configuration hot-wire probe to simultaneously measure three velocity and three vorticity components, as well as other velocity gradient-based turbulence properties, assumes three T-arrays, each with three sensors inclined at 45 degrees to the probe axis. It is shown in this paper that probes having sensors asymmetrically arranged with respect to the probe axis, at specific but different geometrical angles, provide larger angular uniqueness domains in comparison to the original probe. To date it was believed that orthogonal arrays in which three sensors are mounted at 54.74. to the probe axis, as well as their vorticity counterparts, have the largest uniqueness domain of all triple-array-based probes. However, the proposed modified design of the T-array provides uniqueness cone half-angles similar to those that can be achieved by the orthogonal triple-array. In more extreme cases (i.e. at larger departures of the sensor angles from 45 degrees), the uniqueness range of the modified T-array can be made even larger in comparison to the orthogonal array.
PB  - IOP Publishing Ltd, Bristol
T2  - Measurement Science and Technology
T1  - Enlarging the uniqueness cone of the nine-sensor, T-configuration probe to measure the velocity vector and the velocity gradient tensor
IS  - 6
VL  - 21
DO  - 10.1088/0957-0233/21/6/065401
ER  - 

@article{
author = "Petrović, Dragan and Vukoslavčević, Petar V. and Wallace, J.M.",
year = "2010",
abstract = "The original concept of a nine-sensor T-configuration hot-wire probe to simultaneously measure three velocity and three vorticity components, as well as other velocity gradient-based turbulence properties, assumes three T-arrays, each with three sensors inclined at 45 degrees to the probe axis. It is shown in this paper that probes having sensors asymmetrically arranged with respect to the probe axis, at specific but different geometrical angles, provide larger angular uniqueness domains in comparison to the original probe. To date it was believed that orthogonal arrays in which three sensors are mounted at 54.74. to the probe axis, as well as their vorticity counterparts, have the largest uniqueness domain of all triple-array-based probes. However, the proposed modified design of the T-array provides uniqueness cone half-angles similar to those that can be achieved by the orthogonal triple-array. In more extreme cases (i.e. at larger departures of the sensor angles from 45 degrees), the uniqueness range of the modified T-array can be made even larger in comparison to the orthogonal array.",
publisher = "IOP Publishing Ltd, Bristol",
journal = "Measurement Science and Technology",
title = "Enlarging the uniqueness cone of the nine-sensor, T-configuration probe to measure the velocity vector and the velocity gradient tensor",
number = "6",
volume = "21",
doi = "10.1088/0957-0233/21/6/065401"
}

Petrović, D., Vukoslavčević, P. V.,& Wallace, J.M.. (2010). Enlarging the uniqueness cone of the nine-sensor, T-configuration probe to measure the velocity vector and the velocity gradient tensor. in Measurement Science and Technology
IOP Publishing Ltd, Bristol., 21(6).
https://doi.org/10.1088/0957-0233/21/6/065401

Petrović D, Vukoslavčević PV, Wallace J. Enlarging the uniqueness cone of the nine-sensor, T-configuration probe to measure the velocity vector and the velocity gradient tensor. in Measurement Science and Technology. 2010;21(6).
doi:10.1088/0957-0233/21/6/065401 .

Petrović, Dragan, Vukoslavčević, Petar V., Wallace, J.M., "Enlarging the uniqueness cone of the nine-sensor, T-configuration probe to measure the velocity vector and the velocity gradient tensor" in Measurement Science and Technology, 21, no. 6 (2010),
https://doi.org/10.1088/0957-0233/21/6/065401 . .

TY  - JOUR
AU  - Vukoslavčević, Petar V.
AU  - Petrović, Dragan
AU  - Wallace, JM
PY  - 2004
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/853
AB  - The uniqueness range of hot-wire probes to simultaneously measure all three velocity components is analysed analytically. Expressions defining the uniqueness cone half-angle are presented for triple as well as for quadruple sensor configurations. Using these expressions the influence of the main probe parameters on the uniqueness cone, i.e. the number of sensors and their orientation, the effective angle and the pitch and yaw coefficients, are analysed. Different types of probes are compared and optimum parameters are proposed. The same analysis is valid for complex vorticity probes configured as combinations of triple and quadruple sensor arrays.
PB  - IOP Publishing Ltd, Bristol
T2  - Measurement Science and Technology
T1  - An analytical approach to the uniqueness problem of hot-wire probes to measure simultaneously three velocity components
EP  - 1854
IS  - 9
SP  - 1848
VL  - 15
DO  - 10.1088/0957-0233/15/9/023
ER  - 

@article{
author = "Vukoslavčević, Petar V. and Petrović, Dragan and Wallace, JM",
year = "2004",
abstract = "The uniqueness range of hot-wire probes to simultaneously measure all three velocity components is analysed analytically. Expressions defining the uniqueness cone half-angle are presented for triple as well as for quadruple sensor configurations. Using these expressions the influence of the main probe parameters on the uniqueness cone, i.e. the number of sensors and their orientation, the effective angle and the pitch and yaw coefficients, are analysed. Different types of probes are compared and optimum parameters are proposed. The same analysis is valid for complex vorticity probes configured as combinations of triple and quadruple sensor arrays.",
publisher = "IOP Publishing Ltd, Bristol",
journal = "Measurement Science and Technology",
title = "An analytical approach to the uniqueness problem of hot-wire probes to measure simultaneously three velocity components",
pages = "1854-1848",
number = "9",
volume = "15",
doi = "10.1088/0957-0233/15/9/023"
}

Vukoslavčević, P. V., Petrović, D.,& Wallace, J.. (2004). An analytical approach to the uniqueness problem of hot-wire probes to measure simultaneously three velocity components. in Measurement Science and Technology
IOP Publishing Ltd, Bristol., 15(9), 1848-1854.
https://doi.org/10.1088/0957-0233/15/9/023

Vukoslavčević PV, Petrović D, Wallace J. An analytical approach to the uniqueness problem of hot-wire probes to measure simultaneously three velocity components. in Measurement Science and Technology. 2004;15(9):1848-1854.
doi:10.1088/0957-0233/15/9/023 .

Vukoslavčević, Petar V., Petrović, Dragan, Wallace, JM, "An analytical approach to the uniqueness problem of hot-wire probes to measure simultaneously three velocity components" in Measurement Science and Technology, 15, no. 9 (2004):1848-1854,
https://doi.org/10.1088/0957-0233/15/9/023 . .

TY  - JOUR
AU  - Petrović, Dragan
AU  - Vukoslavčević, Petar V.
AU  - Wallace, JM
PY  - 2003
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/680
AB  - The measurement accuracy of different hot-wire probes possessing between two and 12 sensors is analyzed. Experimental data were sampled in a round free jet and in a zero-pressure-gradient turbulent boundary layer by a 12-sensor hot-wire probe. Testing of the various hot-wire configurations is enabled by selectively considering different combinations of the 12 available anemometer output voltages. The influence on the measurement accuracy of neglecting the velocity gradients as well as neglecting one velocity component is analyzed. Two approaches were applied. One is based on expressions that relate the instantaneous velocity components and velocity gradients, and the other is based on a simple least-squares regression method. It is found that neglecting the instantaneous fluctuations of the velocity gradients for the measurement of the cross-stream velocity component, V, has a crucial influence and results in large errors. It is also shown that this influence is less significant or even negligible for the measurement accuracy of the other two velocity components, U and W.
PB  - Springer, New York
T2  - Experiments in Fluids
T1  - The accuracy of turbulent velocity component measurements by multi-sensor hot-wire probes: a new approach to an old problem
EP  - 139
IS  - 1
SP  - 130
VL  - 34
DO  - 10.1007/s00348-002-0544-2
ER  - 

@article{
author = "Petrović, Dragan and Vukoslavčević, Petar V. and Wallace, JM",
year = "2003",
abstract = "The measurement accuracy of different hot-wire probes possessing between two and 12 sensors is analyzed. Experimental data were sampled in a round free jet and in a zero-pressure-gradient turbulent boundary layer by a 12-sensor hot-wire probe. Testing of the various hot-wire configurations is enabled by selectively considering different combinations of the 12 available anemometer output voltages. The influence on the measurement accuracy of neglecting the velocity gradients as well as neglecting one velocity component is analyzed. Two approaches were applied. One is based on expressions that relate the instantaneous velocity components and velocity gradients, and the other is based on a simple least-squares regression method. It is found that neglecting the instantaneous fluctuations of the velocity gradients for the measurement of the cross-stream velocity component, V, has a crucial influence and results in large errors. It is also shown that this influence is less significant or even negligible for the measurement accuracy of the other two velocity components, U and W.",
publisher = "Springer, New York",
journal = "Experiments in Fluids",
title = "The accuracy of turbulent velocity component measurements by multi-sensor hot-wire probes: a new approach to an old problem",
pages = "139-130",
number = "1",
volume = "34",
doi = "10.1007/s00348-002-0544-2"
}

Petrović, D., Vukoslavčević, P. V.,& Wallace, J.. (2003). The accuracy of turbulent velocity component measurements by multi-sensor hot-wire probes: a new approach to an old problem. in Experiments in Fluids
Springer, New York., 34(1), 130-139.
https://doi.org/10.1007/s00348-002-0544-2

Petrović D, Vukoslavčević PV, Wallace J. The accuracy of turbulent velocity component measurements by multi-sensor hot-wire probes: a new approach to an old problem. in Experiments in Fluids. 2003;34(1):130-139.
doi:10.1007/s00348-002-0544-2 .

Petrović, Dragan, Vukoslavčević, Petar V., Wallace, JM, "The accuracy of turbulent velocity component measurements by multi-sensor hot-wire probes: a new approach to an old problem" in Experiments in Fluids, 34, no. 1 (2003):130-139,
https://doi.org/10.1007/s00348-002-0544-2 . .

TY  - JOUR
AU  - Vukoslavčević, Petar V.
AU  - Petrović, Dragan
AU  - Wallace, James M.
PY  - 2002
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/469
AB  - Flow measurement tests of HVAC installations and their elements, with dominant presence of turbulent flows characterized by fluctuations of velocity and vorticity fields, mainly assume measurements of time-averaged velocity fields of applied fluids. These classical methods enabled significant advancing the modern HVAC technique. However, further development in this area, primarily relating to increased efficiency, environment protection, noise control etc., especially in non-stationary conditions, demands a detailed insight in the turbulence structure, among others. This can be achieved by applying the contemporary methods of turbulence modeling, as well as the measuring methods based on laser-Doppler and hot-wire anemometer. In the paper are presented the latest sophisticated techniques that have become operationally available in the previous decade, specified for simultaneous 3-D measurements of turbulent velocity, velocity gradients and vorticity vector fields by the probes containing 9 or 12 sensors within the measuring volumes of about 2.2 mm in diameter. Fundamental role of vorticity and importance of researching its dynamics are also explained.
AB  - Strujno-tehnička ispitivanja instalacija KGH i njihovih elemenata, u kojima dominiraju turbulentna strujanja karakterisana fluktuacijama brzine i vrtložnosti fluida, uglavnom obuhvataju merenja vremenski osrednjenih polja brzine radnih fluida. Ove klasične merne metode su tehniku KGH dovele na zavidan nivo. Ipak, dalji razvoj ove oblasti, prvenstveno sa gledišta poboljšanja efikasnosti sistema KGH, očuvanja okoline, kontrole buke itd., posebno u izrazito nestacionarnim režimima rada, pored ostalog zahteva i detaljan uvid u strukturu odgovarajućih strujnih procesa. To je moguće postići primenom savremenih metoda matematičkog modeliranja turbulencije sa jedne i mernih metoda zasnovanih na primeni laserskog i anemometra sa zagrejanim vlaknima, sa druge strane. U radu su prikazane najsavremenije tehnike mehanike fluida, koje su postale operativne tek u prošloj deceniji, namenjene preciznom simultanom 3-D merenju trenutnih vrednosti fluktuacija brzine, njenih gradijenata i vrtložnosti fluida pomoću minijaturnih sondi sa 9 i 12 zagrejanih vlakana smeštenih u mernoj zapremini prečnika oko 2,2 mm. Objašnjena je i uloga vrtložnosti i značaj istraživanja njene dinamike.
PB  - Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS), Beograd
T2  - Klimatizacija, grejanje, hlađenje
T1  - On the simultaneous 3-D measurements of turbulent velocity and vorticity vectors by hot-wire probes
T1  - O simultanom 3-D merenju turbulentnih vektora brzine i vrtložnosti sondama sa zagrejanim vlaknima
EP  - 59
IS  - 1
SP  - 47
VL  - 31
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_469
ER  - 

@article{
author = "Vukoslavčević, Petar V. and Petrović, Dragan and Wallace, James M.",
year = "2002",
abstract = "Flow measurement tests of HVAC installations and their elements, with dominant presence of turbulent flows characterized by fluctuations of velocity and vorticity fields, mainly assume measurements of time-averaged velocity fields of applied fluids. These classical methods enabled significant advancing the modern HVAC technique. However, further development in this area, primarily relating to increased efficiency, environment protection, noise control etc., especially in non-stationary conditions, demands a detailed insight in the turbulence structure, among others. This can be achieved by applying the contemporary methods of turbulence modeling, as well as the measuring methods based on laser-Doppler and hot-wire anemometer. In the paper are presented the latest sophisticated techniques that have become operationally available in the previous decade, specified for simultaneous 3-D measurements of turbulent velocity, velocity gradients and vorticity vector fields by the probes containing 9 or 12 sensors within the measuring volumes of about 2.2 mm in diameter. Fundamental role of vorticity and importance of researching its dynamics are also explained., Strujno-tehnička ispitivanja instalacija KGH i njihovih elemenata, u kojima dominiraju turbulentna strujanja karakterisana fluktuacijama brzine i vrtložnosti fluida, uglavnom obuhvataju merenja vremenski osrednjenih polja brzine radnih fluida. Ove klasične merne metode su tehniku KGH dovele na zavidan nivo. Ipak, dalji razvoj ove oblasti, prvenstveno sa gledišta poboljšanja efikasnosti sistema KGH, očuvanja okoline, kontrole buke itd., posebno u izrazito nestacionarnim režimima rada, pored ostalog zahteva i detaljan uvid u strukturu odgovarajućih strujnih procesa. To je moguće postići primenom savremenih metoda matematičkog modeliranja turbulencije sa jedne i mernih metoda zasnovanih na primeni laserskog i anemometra sa zagrejanim vlaknima, sa druge strane. U radu su prikazane najsavremenije tehnike mehanike fluida, koje su postale operativne tek u prošloj deceniji, namenjene preciznom simultanom 3-D merenju trenutnih vrednosti fluktuacija brzine, njenih gradijenata i vrtložnosti fluida pomoću minijaturnih sondi sa 9 i 12 zagrejanih vlakana smeštenih u mernoj zapremini prečnika oko 2,2 mm. Objašnjena je i uloga vrtložnosti i značaj istraživanja njene dinamike.",
publisher = "Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS), Beograd",
journal = "Klimatizacija, grejanje, hlađenje",
title = "On the simultaneous 3-D measurements of turbulent velocity and vorticity vectors by hot-wire probes, O simultanom 3-D merenju turbulentnih vektora brzine i vrtložnosti sondama sa zagrejanim vlaknima",
pages = "59-47",
number = "1",
volume = "31",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_469"
}

Vukoslavčević, P. V., Petrović, D.,& Wallace, J. M.. (2002). On the simultaneous 3-D measurements of turbulent velocity and vorticity vectors by hot-wire probes. in Klimatizacija, grejanje, hlađenje
Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije (SMEITS), Beograd., 31(1), 47-59.
https://hdl.handle.net/21.15107/rcub_agrospace_469

Vukoslavčević PV, Petrović D, Wallace JM. On the simultaneous 3-D measurements of turbulent velocity and vorticity vectors by hot-wire probes. in Klimatizacija, grejanje, hlađenje. 2002;31(1):47-59.
https://hdl.handle.net/21.15107/rcub_agrospace_469 .

Vukoslavčević, Petar V., Petrović, Dragan, Wallace, James M., "On the simultaneous 3-D measurements of turbulent velocity and vorticity vectors by hot-wire probes" in Klimatizacija, grejanje, hlađenje, 31, no. 1 (2002):47-59,
https://hdl.handle.net/21.15107/rcub_agrospace_469 .