Analysis of heat transfer and flow over a rotating cylinder at subcritical Reynolds numbers based on Taguchi method

N.A.

Makale detayları

Analysis of heat transfer and flow over a rotating cylinder at subcritical Reynolds numbers based on Taguchi method

Yazarlar:

N.A.

Yayıncı:

Yildiz Technical University

Ana Başlıklar:

Thermodynamics and Statistical Physics

Dergi:

Journal of Thermal Engineering Vol.9 Issue 4, pp.998-1014

Belge Tipi:

Makale

Yayın Tarihi:

4/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001293764

pISSN:

2148-7847

Anahtar kelimeler:

Özet:

 The flow past the rotating circular cylinder and the effect of buoyancy on heat transfer char-acteristics are studied numerically for the Reynolds number of 20 and 40 and the Prandtl number of 0.7. The lift and drag coefficients, Strouhal number, and local Nusselt number on the cylinder are studied under the sway of combined buoyancy at the Richardson num-ber varies from 0 to 2 and different rotational directions. Although the interaction between buoyancy and rotation is a puzzling heat transfer problem, the direction of rotation is found to have significant effects on the flow patterns and heat transfer rate. The main innovation of the present work is to determine the extreme points of Nusselt numbers when different conditions are applied. For a positive rotation, the maximum local Nusselt number is at θ225o, and the minimum local Nusselt number is at θ100o. In contrast, for a negative rotation, the maxi-mum and minimum local Nusselt numbers are at θ140o and θ270o, respectively. Applying Taguchi method, it is found that average Nusselt number is more dependent on Reynolds number than other factors. Additionally, it can be concluded that the direction of rotation can be used as a powerful tool to adjust the heat transfer rate and the required value of drag and lift. Consequently, without applying different rotation speeds, it would be difficult to stabilize the flow, and with the aid of Taguchi method, it is determined that rotation is deciding factor in stabilizing flow patterns. The results are in good agreement with the experimental results.

 The flow past the rotating circular cylinder and the effect of buoyancy on heat transfer char-acteristics are studied numerically for the Reynolds number of 20 and 40 and the Prandtl number of 0.7. The lift and drag coefficients, Strouhal number, and local Nusselt number on the cylinder are studied under the sway of combined buoyancy at the Richardson num-ber varies from 0 to 2 and different rotational directions. Although the interaction between buoyancy and rotation is a puzzling heat transfer problem, the direction of rotation is found to have significant effects on the flow patterns and heat transfer rate. The main innovation of the present work is to determine the extreme points of Nusselt numbers when different conditions are applied. For a positive rotation, the maximum local Nusselt number is at θ225o, and the minimum local Nusselt number is at θ100o. In contrast, for a negative rotation, the maxi-mum and minimum local Nusselt numbers are at θ140o and θ270o, respectively. Applying Taguchi method, it is found that average Nusselt number is more dependent on Reynolds number than other factors. Additionally, it can be concluded that the direction of rotation can be used as a powerful tool to adjust the heat transfer rate and the required value of drag and lift. Consequently, without applying different rotation speeds, it would be difficult to stabilize the flow, and with the aid of Taguchi method, it is determined that rotation is deciding factor in stabilizing flow patterns. The results are in good agreement with the experimental results.

 The flow past the rotating circular cylinder and the effect of buoyancy on heat transfer char-acteristics are studied numerically for the Reynolds number of 20 and 40 and the Prandtl number of 0.7. The lift and drag coefficients, Strouhal number, and local Nusselt number on the cylinder are studied under the sway of combined buoyancy at the Richardson num-ber varies from 0 to 2 and different rotational directions. Although the interaction between buoyancy and rotation is a puzzling heat transfer problem, the direction of rotation is found to have significant effects on the flow patterns and heat transfer rate. The main innovation of the present work is to determine the extreme points of Nusselt numbers when different conditions are applied. For a positive rotation, the maximum local Nusselt number is at θ225o, and the minimum local Nusselt number is at θ100o. In contrast, for a negative rotation, the maxi-mum and minimum local Nusselt numbers are at θ140o and θ270o, respectively. Applying Taguchi method, it is found that average Nusselt number is more dependent on Reynolds number than other factors. Additionally, it can be concluded that the direction of rotation can be used as a powerful tool to adjust the heat transfer rate and the required value of drag and lift. Consequently, without applying different rotation speeds, it would be difficult to stabilize the flow, and with the aid of Taguchi method, it is determined that rotation is deciding factor in stabilizing flow patterns. The results are in good agreement with the experimental results.

 The flow past the rotating circular cylinder and the effect of buoyancy on heat transfer char-acteristics are studied numerically for the Reynolds number of 20 and 40 and the Prandtl number of 0.7. The lift and drag coefficients, Strouhal number, and local Nusselt number on the cylinder are studied under the sway of combined buoyancy at the Richardson num-ber varies from 0 to 2 and different rotational directions. Although the interaction between buoyancy and rotation is a puzzling heat transfer problem, the direction of rotation is found to have significant effects on the flow patterns and heat transfer rate. The main innovation of the present work is to determine the extreme points of Nusselt numbers when different conditions are applied. For a positive rotation, the maximum local Nusselt number is at θ225o, and the minimum local Nusselt number is at θ100o. In contrast, for a negative rotation, the maxi-mum and minimum local Nusselt numbers are at θ140o and θ270o, respectively. Applying Taguchi method, it is found that average Nusselt number is more dependent on Reynolds number than other factors. Additionally, it can be concluded that the direction of rotation can be used as a powerful tool to adjust the heat transfer rate and the required value of drag and lift. Consequently, without applying different rotation speeds, it would be difficult to stabilize the flow, and with the aid of Taguchi method, it is determined that rotation is deciding factor in stabilizing flow patterns. The results are in good agreement with the experimental results.

Makale detayları

Analysis of heat transfer and flow over a rotating cylinder at subcritical Reynolds numbers based on Taguchi method

Yazarlar:

N.A.

Yayıncı:

Yildiz Technical University

Ana Başlıklar:

Thermodynamics and Statistical Physics

Dergi:

Journal of Thermal Engineering Vol.9 Issue 4, pp.998-1014

Belge Tipi:

Makale

Yayın Tarihi:

4/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001293764

pISSN:

2148-7847

Thermal Buoyancy

Rotational Cylinder

Vortex Shedding

Aerodynamic Force

Taguchi Method

Sayı

Makale detayları

Analysis of heat transfer and flow over a rotating cylinder at subcritical Reynolds numbers based on Taguchi method

Yazarlar: N.A.

Yayıncı: Yildiz Technical University

Ana Başlıklar: Thermodynamics and Statistical Physics

Dergi: Journal of Thermal Engineering Vol.9 Issue 4, pp.998-1014

Belge Tipi: Makale

Yayın Tarihi: 4/2023

Belge Dili: İngilizce

Document ID (Org No.): 2001293764

pISSN: 2148-7847

Thermal Buoyancy

Rotational Cylinder

Vortex Shedding

Aerodynamic Force

Taguchi Method

Sayı

Yazarlar:

N.A.

Yayıncı:

Yildiz Technical University

Ana Başlıklar:

Thermodynamics and Statistical Physics

Dergi:

Journal of Thermal Engineering Vol.9 Issue 4, pp.998-1014

Belge Tipi:

Makale

Yayın Tarihi:

4/2023

Belge Dili:

İngilizce

Document ID (Org No.):

2001293764

pISSN:

2148-7847