New Correlations for Flow and Conjugate Heat Transfer With Surface Radiation Characteristics of a Real-Scale Infrared Suppression System With Conical Funnels

Mukherjee, Arnab; Chandrakar, Vikrant; Senapati, Jnana Ranjan

doi:10.1115/1.4051129

Cited by 21 publications

(5 citation statements)

References 27 publications

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“…The radiation heat transfer equation for scattering, absorbing, and emitting, medium at some location r in the direction of s as given by Chandrakar et al, 26 Mukherjee et al, 27 and Saedodin 40 is calculated by

\frac{dI (r, s)}{italicds} + (a + σ_{s}) I (r, s) = a n^{2} \frac{σ T^{2}}{π} + \frac{σ_{s}}{4 π} \int_{0}^{4 π} I (r, s false') \emptyset (s, s') d θ^{true'},

where the absorption coefficient is denoted by a , the refractive index is denoted by n , the radiation intensity is denoted by I , the scattering coefficient is denoted by

σ_{s}

the phase function is denoted by

ϕ

, and the solid angle by

θ

.…”

Section: Numerical Approachmentioning

confidence: 99%

“…The radiation heat transfer equation for scattering, absorbing, and emitting, medium at some location r in the direction of s as given by Chandrakar et al, 26 Mukherjee et al, 27…”

Section: Radiation Equationmentioning

confidence: 99%

“…Further, it has been noticed that cooling is faster with radiated heat transfer than heat transfer without radiation. An investigation on surface radiation, including forced convection and conjugate heat transfer from the hot body of funnel shape (IRS device), has been conducted by Mukherjee et al 27 The

SST k - ω

model has been used for simulation and DO is used for radiation modeling. The inclusion of radiation heat transfer results in an increased mass suction ratio into the IRS device above

6 %

and a fall in temperature at the exit by

2.94 % .

The conjugate heat transfer and radiative energy calculations involved in the above problem provide more accurate results and closure to a practical problem.…”

Section: Introductionmentioning

confidence: 99%

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Study of combined effect of natural convection and radiation heat transfer from annular finned vertical cylinder

et al. 2022

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The present numerical study reports the combined effect of natural convection and radiation heat from a vertical cylinder with annular fins. The study involves simulation for laminar as well as turbulent regimes. For the present study, Rayleigh's number is varied in the range 108−1012, emissivity in the range 0.2−0.8, and the fin spacing ratio (s/d) in the range 0.1−10. The radiation heat transfer has been found to share a considerable amount in the total heat transfer of the system for the laminar regime, but in the turbulent regime, its effect is minimal and can be neglected. When the fin spacing ratio is reduced, the total heat transfer increases for both the turbulent and laminar flow conditions. But the radiation heat increases with a reduction in fin spacing ratio for laminar and in case of turbulent flow radiation heat rate reduces with a reduction in s/d ratio. For the range of Rayleigh numbers considered in the present study, the Nusselt number increases with the increment of the fin spacing ratio. Thus, it can be concluded that there is a remarkable enhancement in the heat transfer rate in laminar cases with the fins. For turbulent cases, the fin efficiency lies between 40% and 50%.

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\frac{dI (r, s)}{italicds} + (a + σ_{s}) I (r, s) = a n^{2} \frac{σ T^{2}}{π} + \frac{σ_{s}}{4 π} \int_{0}^{4 π} I (r, s false') \emptyset (s, s') d θ^{true'},

where the absorption coefficient is denoted by a , the refractive index is denoted by n , the radiation intensity is denoted by I , the scattering coefficient is denoted by

σ_{s}

the phase function is denoted by

ϕ

, and the solid angle by

θ

.…”

Section: Numerical Approachmentioning

confidence: 99%

“…The radiation heat transfer equation for scattering, absorbing, and emitting, medium at some location r in the direction of s as given by Chandrakar et al, 26 Mukherjee et al, 27…”

Section: Radiation Equationmentioning

confidence: 99%

SST k - ω

model has been used for simulation and DO is used for radiation modeling. The inclusion of radiation heat transfer results in an increased mass suction ratio into the IRS device above

6 %

and a fall in temperature at the exit by

2.94 % .

The conjugate heat transfer and radiative energy calculations involved in the above problem provide more accurate results and closure to a practical problem.…”

Section: Introductionmentioning

confidence: 99%

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Study of combined effect of natural convection and radiation heat transfer from annular finned vertical cylinder

et al. 2022

Self Cite

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show abstract

“…Mohanty et al [12] investigated the flow field of IRS suppression device with a conical funnel and found that cylindrical funnels have higher air entrainment coefficient than conical funnels. Mukherjee et al [13] proposed a correlation between the mass inlet ratio and temperature ratio of outlet by investigating the geometric parameters of the Infrared Suppression System. Chandrakar et al [14] researched the comprehensive effect of free convection and surface radiation in infrared suppression devices and showed that surface radiation can influence the convection characteristics.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2023

Brodogradnja

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The high-temperature exhaust gases and the hot surfaces of the ejector device in marine gas turbines generate significant levels of infrared radiation. An appropriate nozzle structure can effectively lower the exhaust gas temperature and reduce the high-temperature radiation surface area, thereby minimizing external infrared radiation. In this study, a numerical simulation of the nozzle structure in the ejector device was conducted using computational fluid dynamics (CFD) methods. By investigating the orthogonal combinations of nozzle inclination angles and the number of nozzles, the temperature distribution and flow characteristics under different operating conditions were analysed. The results showed that as the nozzle inclination angle increased, the entrainment coefficient (Ce) and the temperature ratio at the inlet and outlet (Rt) initially improved but then worsened. Simultaneously, the pressure loss coefficient (Cpl) increased with the inclination angle. The CRITIC weight method was employed to objectively allocate weights to Rt, Ce, and Cpl, determining the optimal solution. The results indicated that Rt and Cpl had significant and similar weights. The optimal solution was found in Case 10 (α = 5°, x = 4), with corresponding evaluation indices of Ce=2.38, Cpl=11.45, and =0.68. This study's findings are of great importance for enhancing the performance of marine gas turbines and reducing external infrared radiation.

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“…Unsteady mixed forced-buoyancy convection through channel with a forward facing step by addressing the mirror in a duct undergoing sudden expansion was presented by Inam and Lappa (2022). Fluid flow and heat transfer characteristics in infrared suppression (IRS) device, which is complex nature of the flow features, were discussed by Mukharjee et al (2021). They have taken cool ambient air by mixing of hot exhaust gas from the engine in the cargo/naval ships are done inside the IRS system as working fluid.…”

Section: Introductionmentioning

confidence: 99%

Numerical studies on conjugate convection from discretely heated electronic board

Battula

Daravath

Gampa

2022

WJE

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Purpose This paper deals with numerical studies into combined conduction, convection and radiation from a heated vertical electronic board are provided here. Design/methodology/approach Here three inbuilt heaters with decrease in their heights were placed in the vertical electronic board. With respect to the non-heat portions, two configurations were studied. The first considers the non-heat portions to be adiabatic, while in the second, they are non-adiabatic. The heat that is produced in three heaters is conducted along the board and is dissipated either from the heater portions alone or from the whole board by convection and radiation. Air is considered as working medium, while the equations of heat transfer and flow of fluid are handled without boundary layer approximations. These equations were further solved using finite volume method with Gauss–Seidel iteration method. Findings Results of various comparative studies were discussed to bring out the relevance of thermal conductivity, modified Richardson number and surface emissivity on different heat transfer and flow results concerning this problem. Originality/value The optimum values of surface emissivity, thermal conductivity and modified Richardson number have also been notionally explored.

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New Correlations for Flow and Conjugate Heat Transfer With Surface Radiation Characteristics of a Real-Scale Infrared Suppression System With Conical Funnels

Cited by 21 publications

References 27 publications

Study of combined effect of natural convection and radiation heat transfer from annular finned vertical cylinder

Study of combined effect of natural convection and radiation heat transfer from annular finned vertical cylinder

Untitled

Numerical studies on conjugate convection from discretely heated electronic board

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