Skin Simulants with Depth Magnification.
MASSACHUSETTS INST OF TECH CAMBRIDGE FUELS RESEARCH LAB
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Principles are presented for the design of single- and two-component systems for simulating human skin or other materials of interest in studies of steady and unsteady-state heat conduction. Such simulants must accept heat at a rate identical to the acceptance rate of the material simulated. Thus, the product rho and the quotient rho must be identical for the primary material and its simulant k is thermal conductivity and rho is volumetric heat capacity. For heat transfer studies in which knowledge of the temperature-time-depth relation in thin material is desired it is advantageous to design the simulant with its depth dimension stretched relative to depths in the material simulated. Detailed designs are presented for heterogeneous simulants employing copper and air, with kcrho and krho values equal to those of human skin and with a stretch factor of 28.4. Several such simulants have been constructed and instrumented with thermocouples at depths corresponding to 0.01 to 0.16 cm depth in skin. Performance of the various simulants has matched the theoretical for opaque semi-infinite solids for periods ranging from at least 4 seconds to more than 10 seconds. The skin simulants are to be used for studies of the temperature-time-depth relationship following exposure of both bare and cloth-covered simulants to radiant energy pulses. Attempts will be made to correlate both types of tests with University of Rochester tests on burning of the skin of Chester White pigs.
- Medicine and Medical Research