# [gpumd] Re: The factor 160 in thermal conductance term on plot_shc.m file.

• From: Bruce Fan <brucenju@xxxxxxxxx>
• To: gpumd@xxxxxxxxxxxxx
• Date: Wed, 6 Nov 2019 11:28:44 +0200

If yo need a step-by-step derivation, here is it:

[Thermal Conductance]
= [Energy Exchange Rate] / [Area] / [Temperature Difference]
= eV / ps / nm^2 / K
= 1.6e-19 J / 1.0e-12 s / 1.0e-18 m^2 / K
= 1.6e(-19+12+18) J / s / m^2/ K
= 1.6e+11 W / m^2 / K
= 160 * 1.0e+9 W / m^2 / K
= 160 GW / m^2 / K

Zheyong

On Wed, Nov 6, 2019 at 5:37 AM "소순성" <soonsung2001@xxxxxxxxxx> wrote:

Dear haikuan

Thank you for your kind answer~!

Soonsung So.

--------- 원본 메일 ---------

*보낸사람* : "董海宽" <dhk@xxxxxxxxxx>
*받는사람* : <gpumd@xxxxxxxxxxxxx>
*받은날짜* : 2019년 Nov 6일(Wed) 12:12:43
*제목* : [gpumd] Re:[gpumd] The factor 160 in thermal conductance term on
plot_shc.m file.
Hi,

I'll answer your question.

The "160" is the unit conversion factor.
such as    G=160*Q/A/temp_difference,
where, G (GW/m^2K),  Q (eV/ps), A (nm^2), and temp_difference(K) need to
be unified in units.
For heat flux Q， 1 (ev/ps) = 1.60*10^{-19} /10^{-12}  (J/s) = 1.60*10^{-7}
(W).
That should make sense to you.

haikuan

---------- Origin message ----------
From："" <soonsung2001@xxxxxxxxxx>
To：gpumd@xxxxxxxxxxxxx
Subject：[gpumd] The factor 160 in thermal conductance term on plot_shc.m
file.
Date：2019-11-06 10:04:54

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