RADM

Bulk Data Entry Defines the radiation material properties of a surface element for heat transfer analysis.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
RADM RMID ABSORP EMIS1            

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
RADM 24 0.2 1.0            

Definitions

Field Contents SI Unit Example
RMID Radiation material property entry identification number.

No default (Integer > 0)

 
ABSORP Surface absortivity.

No default (0.0 ≤ Real ≤ 1.0)

 
EMIS1 Surface emissivity.

No default (0.0 ≤ Real ≤ 1.0)

 

Comments

  1. The RADM entry can be referenced by a CHBDYE Bulk Data Entry.
  2. The Radiation Heat Flux is calculated as follows, between the surface element and the black-body space node.(1)
    q=σFAMB( ε e ( T e + T abs ) 4 α e ( T amb + T abs ) 4 ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyCaiabg2 da9iabeo8aZjabgwSixlaabAeacaqGbbGaaeytaiaabkeacqGHflY1 daqadaqaaiabew7aLnaaBaaaleaacaWGLbaabeaakmaabmaabaGaam ivamaaBaaaleaacaWGLbaabeaakiabgUcaRiaadsfadaWgaaWcbaGa amyyaiaadkgacaWGZbaabeaaaOGaayjkaiaawMcaamaaCaaaleqaba GaaGinaaaakiabgkHiTiabeg7aHnaaBaaaleaacaWGLbaabeaakmaa bmaabaGaamivamaaBaaaleaacaWGHbGaamyBaiaadkgaaeqaaOGaey 4kaSIaamivamaaBaaaleaacaWGHbGaamOyaiaadohaaeqaaaGccaGL OaGaayzkaaWaaWbaaSqabeaacaaI0aaaaaGccaGLOaGaayzkaaaaaa@5D96@
    Where,
    q MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyCaaaa@36EC@
    Radiation heat flux.
    σ
    Stefan-Boltzmann constant defined via PARAM, SIGMA.
    FAMB MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaaeOraiaabg eacaqGnbGaaeOqaaaa@3918@
    Radiation view factor between the element face and the ambient space node.
    ε e MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeqyTdu2aaS baaSqaaiaadwgaaeqaaaaa@38B3@
    Surface emissivity of the surface element, defined by EMIS1 on the RADM entry.
    α e MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeqySde2aaS baaSqaaiaadwgaaeqaaaaa@38AB@
    Surface absorptivity of the surface element, defined by ABSORP field on the RADM entry.
    T e MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamivamaaBa aaleaacaWGLbaabeaaaaa@37E5@
    Surface temperature.
    T abs MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamivamaaBa aaleaacaWGHbGaamOyaiaadohaaeqaaaaa@39C0@
    Absolute temperature scale factor defined via PARAM, TABS.
    T amb MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamivamaaBa aaleaacaWGHbGaamyBaiaadkgaaeqaaaaa@39BA@
    Ambient temperature.
  3. For a Heat Transfer Analysis via Radiation, PARAM,TABS can be used to define the absolute temperature scale, and PARAM,SIGMA is used to specify the Stefan-Boltzmann constant. Additionally, a RADBC entry can be used to define radiation boundary conditions.