Convection Property Definition
Description: Specifies the free convection boundary condition properties of a surface element used for heat transfer analysis.
Format:
Example:
| Field | Definition | Type | Default |
|---|---|---|---|
| PID | Convection property identification number. | Integer > 0 | Required |
| MID | Material property identification number. | Integer > 0 | Required |
| FORM | Film temperature option if film grid point is not specified. See Remark 3. | 1 ≤ Integer ≤ 3 | 1 |
| CTID1, CTID2, CTID3 | TABLEDi set identification numbers that define control point position dependent scale factors in the x, y, and z directions of the basic coordinate system. See Remark 1. | Integer > 0 or blank | |
| ATID1, ATID2, ATID3 | TABLEDi set identification numbers that define ambient point position dependent scale factors in the x, y, and z directions of the basic coordinate system. See Remark 1. | Integer > 0 or blank |
Remarks:
- Every surface to which free convection is to be applied must reference a PCONV entry. PCONV is referenced on the CONV Bulk Data Entry.
- MID is used to supply the convection heat transfer coefficient (H).
- The FORM field specifies how temperatures are averaged to determine film temperature. The options are described as follows:
FORM Description 1 Film temperature is the average of average surface and average ambient temperatures 2 Film temperature is the average of surface temperatures 3 Film temperature is the average of ambient temperatures - The basic exchange relationship can be expressed in one of the following forms:
, CNTRLND ≠ 0
, CNTRLND = 0
where c (x, y, z) is defined as the product of scale factors returned by tables defined in fields 6, 7, and 8, and a (x, y, z) is defined as the product of scale factors returned by tables defined in field 9 and fields 2 and 3 on the continuation entry.